Taille disque insuffisante

Bonjour à tous,
Depuis quelques jours, la taille de mon disque C augmente et diminue de façon anormale alors que je n'ai ajouté aucun fichier ni aucun document. J'en étais arrivée à 686 Ko seulement de libre!!! J'ai pensé que c'était du à mon antivirus avec ses mises à jour mais même après les mises à jour ça persiste. J'aimerais donc que vous m'aidiez à voir si c'est un virus qui agit S'il vous plait. Voici un log de hijackthis

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\WIDCOMM\Bluetooth Software\bin\btwdins.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Google\Update\GoogleUpdate.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Hewlett-Packard\HP Wireless Assistant\HPWAMain.exe
C:\Program Files\Microsoft Office\Office12\GrooveMonitor.exe
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\MOM.EXE
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe
C:\Program Files\DAP\DAP.EXE
C:\Program Files\Atempo\LiveBackup\atrayind.exe
C:\Program Files\Analog Devices\Core\smax4pnp.exe
C:\Program Files\Atempo\LiveBackup\WACCESS.EXE
C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe
C:\Program Files\Websense\WDC\WsUIMgr.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\SuperCopier2\SuperCopier2.exe
C:\Program Files\Windows Live\Messenger\MsnMsgr.Exe
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\ccc.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\WIDCOMM\Bluetooth Software\BTTray.exe
C:\Program Files\Atempo\LiveBackup\amnt.exe
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe
C:\Program Files\LANDesk\Shared Files\residentagent.exe
C:\Program Files\Cisco Systems\VPN Client\cvpnd.exe
C:\Program Files\LANDesk\LDClient\LocalSch.EXE
C:\WINDOWS\system32\CBA\pds.exe
C:\Program Files\LANDesk\LDClient\tmcsvc.exe
C:\PROGRA~1\LANDesk\LDClient\issuser.exe
C:\Program Files\Kaspersky Lab\NetworkAgent\klnagent.exe
C:\Program Files\LANDesk\LDClient\policy.client.invoker.exe
C:\PROGRA~1\WIDCOMM\BLUETO~1\BTSTAC~1.EXE
C:\Program Files\LANDesk\LDClient\xddclient.exe
C:\WINDOWS\System32\NiWsdSrv.srv
C:\Program Files\PlateSpin PowerConvert Server\Controller\OfxController.exe
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe
C:\WINDOWS\system32\NiWSD.exe
C:\WINDOWS\System32\svchost.exe
C:\PROGRA~1\LANDesk\LDClient\collector.exe
C:\Program Files\LANDesk\LDClient\softmon.exe
C:\PROGRA~1\LANDesk\LDClient\LDregwatch.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\Program Files\Atempo\LiveBackup\wengine.exe
C:\Program Files\Hewlett-Packard\Shared\hpqwmiex.exe
C:\Program Files\Atempo\LiveBackup\WVRULES.EXE
C:\Program Files\Atempo\LiveBackup\NAMESYNC.EXE
C:\PROGRA~1\LANDesk\LDClient\rcgui.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe
C:\Program Files\Hewlett-Packard\Shared\HpqToaster.exe
C:\Program Files\Windows Live\Contacts\wlcomm.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Java\jre1.6.0_07\bin\jucheck.exe
C:\Program Files\hijackthis\HiJackThis.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = https://www.bing.com/?cc=fr&toHttps=1&redig=D4322FEE7CF74A348CB9CE970F098EF5
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.msn.com/fr-fr/?ocid=iehp
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: LphantBar Toolbar - {6b284373-1765-4464-a587-80fbc2b2eefa} - C:\Program Files\LphantBar\tbLph1.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: LphantBar Toolbar - {6b284373-1765-4464-a587-80fbc2b2eefa} - C:\Program Files\LphantBar\tbLph1.dll
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\Program Files\Microsoft Office\Office12\GrooveShellExtensions.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\5.0.926.3450\swg.dll
O2 - BHO: PDFCreator Toolbar Helper - {C451C08A-EC37-45DF-AAAD-18B51AB5E837} - C:\Program Files\PDFCreator Toolbar\v3.3.0.1\PDFCreator_Toolbar.dll
O2 - BHO: Ask Toolbar BHO - {F0D4B231-DA4B-4daf-81E4-DFEE4931A4AA} - C:\Program Files\AskSBar\bar\1.bin\ASKSBAR.DLL
O3 - Toolbar: PDFCreator Toolbar - {31CF9EBE-5755-4A1D-AC25-2834D952D9B4} - C:\Program Files\PDFCreator Toolbar\v3.3.0.1\PDFCreator_Toolbar.dll
O3 - Toolbar: Ask Toolbar - {F0D4B239-DA4B-4daf-81E4-DFEE4931A4AA} - C:\Program Files\AskSBar\bar\1.bin\ASKSBAR.DLL
O3 - Toolbar: LphantBar Toolbar - {6b284373-1765-4464-a587-80fbc2b2eefa} - C:\Program Files\LphantBar\tbLph1.dll
O4 - HKLM\..\Run: [StartCCC] C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe
O4 - HKLM\..\Run: [hpWirelessAssistant] %ProgramFiles%\Hewlett-Packard\HP Wireless Assistant\HPWAMain.exe
O4 - HKLM\..\Run: [GrooveMonitor] "C:\Program Files\Microsoft Office\Office12\GrooveMonitor.exe"
O4 - HKLM\..\Run: [SoundMAX] C:\Program Files\Analog Devices\SoundMAX\Smax4.exe /tray
O4 - HKLM\..\Run: [AVP] "C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe"
O4 - HKLM\..\Run: [DownloadAccelerator] "C:\Program Files\DAP\DAP.EXE" /STARTUP
O4 - HKLM\..\Run: [Atempo] "C:\Program Files\Atempo\LiveBackup\atrayind.exe"
O4 - HKLM\..\Run: [Atempo2] "C:\Program Files\Atempo\LiveBackup\wcheck.exe"
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Program Files\Analog Devices\Core\smax4pnp.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe"
O4 - HKLM\..\Run: [WsUiMgr] C:\Program Files\Websense\WDC\WsUIMgr.exe
O4 - HKLM\..\Run: [UserFaultCheck] %systemroot%\system32\dumprep 0 -u
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [SuperCopier2.exe] C:\Program Files\SuperCopier2\SuperCopier2.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\Windows Live\Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: BTTray.lnk = ?
O4 - Global Startup: Cisco Systems VPN Client.lnk = C:\Program Files\Cisco Systems\VPN Client\vpngui.exe
O8 - Extra context menu item: &Clean Traces - C:\Program Files\DAP\Privacy Package\dapcleanerie.htm
O8 - Extra context menu item: &Download with &DAP - C:\Program Files\DAP\dapextie.htm
O8 - Extra context menu item: Ajouter à Kaspersky Anti-Banner - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\ie_banner_deny.htm
O8 - Extra context menu item: Download &all with DAP - C:\Program Files\DAP\dapextie2.htm
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Envoyer au périphérique &Bluetooth... - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie_ctx.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra button: Statistiques d’Anti-Virus Internet - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\SCIEPlgn.dll
O9 - Extra button: Ajout Direct - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: &Ajout Direct dans Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: @btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @btrez.dll,-12650 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {280528CE-B516-47DC-A210-5F323ACC5755} (lbsetup Class) - http://192.168.10.15/lbclient/ocx/ax28.cab
O16 - DPF: {5AA580AE-A3E9-4A9C-9C49-7EC814C8E2ED} (CamTraceViewer Class) - http://192.168.10.160/lib/download/CamTraceViewer.cab
O16 - DPF: {867E13F2-7F31-44FB-AC97-CD38E0DC46EF} - https://www.touslesdrivers.com/index.php?v_page=29
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = Neurotech.lan
O17 - HKLM\Software\..\Telephony: DomainName = Neurotech.lan
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = Neurotech.lan
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\Program Files\Microsoft Office\Office12\GrooveSystemServices.dll
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - AppInit_DLLs: C:\PROGRA~1\KASPER~1\KASPER~1.0FO\adialhk.dll
O23 - Service: LiveBackup Network Service (Amnt) - Atempo, Inc. - C:\Program Files\Atempo\LiveBackup\amnt.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: Kaspersky Anti-Virus 6.0 (AVP) - Kaspersky Lab - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe
O23 - Service: Bluetooth Service (btwdins) - Broadcom Corporation. - C:\Program Files\WIDCOMM\Bluetooth Software\bin\btwdins.exe
O23 - Service: LANDesk(R) Management Agent (CBA8) - LANDesk Software, Ltd. - C:\Program Files\LANDesk\Shared Files\residentagent.exe
O23 - Service: Cisco Systems, Inc. VPN Service (CVPND) - Cisco Systems, Inc. - C:\Program Files\Cisco Systems\VPN Client\cvpnd.exe
O23 - Service: LiveBackup Disaster Recovery (DreSrvc) - Atempo, Inc. - C:\Program Files\Atempo\LiveBackup\DRESrvc.exe
O23 - Service: Service Google Update (gupdate1c998bbbbd03ca4) (gupdate1c998bbbbd03ca4) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: hpqwmiex - Hewlett-Packard Development Company, L.P. - C:\Program Files\Hewlett-Packard\Shared\hpqwmiex.exe
O23 - Service: Intel Local Scheduler Service - LANDesk Software, Ltd. - C:\Program Files\LANDesk\LDClient\LocalSch.EXE
O23 - Service: Intel PDS - LANDesk Software Ltd. - C:\WINDOWS\system32\CBA\pds.exe
O23 - Service: Multicast LANDesk ciblé (Intel Targeted Multicast) - LANDesk Software, Ltd. - C:\Program Files\LANDesk\LDClient\tmcsvc.exe
O23 - Service: Service de contrôle à distance LANDesk (ISSUSER) - LANDesk Software, Ltd. - C:\PROGRA~1\LANDesk\LDClient\issuser.exe
O23 - Service: Kaspersky Network Agent (klnagent) - Kaspersky Lab - C:\Program Files\Kaspersky Lab\NetworkAgent\klnagent.exe
O23 - Service: LANDesk Policy Invoker - LANDesk Software, Ltd. - C:\Program Files\LANDesk\LDClient\policy.client.invoker.exe
O23 - Service: LANDesk(R) Extended device discovery service (LDXDD) - Unknown owner - C:\Program Files\LANDesk\LDClient\xddclient.exe
O23 - Service: Network Instruments Web Server (NiWebSrv) - Unknown owner - C:\WINDOWS\System32\NiWsdSrv.srv
O23 - Service: PlateSpin Operations Framework Controller (OfxController) - PlateSpin Ltd. - C:\Program Files\PlateSpin PowerConvert Server\Controller\OfxController.exe
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - CACE Technologies - C:\Program Files\WinPcap\rpcapd.exe
O23 - Service: LANDesk(R) Software Monitoring Service (Softmon) - LANDesk Software, Ltd. - C:\Program Files\LANDesk\LDClient\softmon.exe
O23 - Service: Websense Desktop Client (WebsenseDesktopClient) - Websense - C:\Program Files\Websense\WDC\WDC.exe
O23 - Service: LiveBackup Client Service (WEngine) - Atempo, Inc. - C:\Program Files\Atempo\LiveBackup\wengine.exe