VIRUS A L AIDE SVP

Bonjour voilou, j'ai un soucis de virus ou pas ....
j'avais avast edition familiale, qui ne me detectait aucuns soucis, ensuite Nod32 qui detecte tjr rien, ce qui me mets la puce a l'oreille d'un probable virus c'est la fenetre de pub qui s'ouvre sans que je demande rien .... " centre de sécurité windows avec dedans inscrit alerte anti virus votre systeme subit l'intrusion d'un logiciel espion ( spyware ) ...
de là je décide de faire un scan en ligne, sur le site f secure qui me detecte lui un virus voilà le rapport :

Scanning Report
Tuesday, September 25, 2007 18:40:21 - 19:18:38
Computer name: titi
Scanning type: Scan system for viruses, rootkits, spyware
Target: C:\

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Result: 2 malware found
Stealth_application (hidden item)
C:\WINDOWS\SYSTEM32\KGDAMIFCEC.EXE (Deleted & Submitted)
W32/Suspicious_F.gen (virus)
C:\DOCUMENTS AND SETTINGS\THIERRY\BUREAU\INTERNET.DOWNLOAD.MANAGER.V5.05.MULTILANGAGES.INCL-KEYGEN\KEYGEN\KEYGEN.EXE

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Statistics
Scanned:
Files: 23609
System: 3478
Not scanned: 8
Actions:
Disinfected: 0
Renamed: 0
Deleted: 1
None: 1
Submitted: 1
Files not scanned:
C:\PAGEFILE.SYS
C:\WINDOWS\SYSTEM32\DRIVERS\SPTD.SYS
C:\WINDOWS\SYSTEM32\CONFIG\DEFAULT
C:\WINDOWS\SYSTEM32\CONFIG\SAM
C:\WINDOWS\SYSTEM32\CONFIG\SECURITY
C:\WINDOWS\SYSTEM32\CONFIG\SOFTWARE
C:\WINDOWS\SYSTEM32\CONFIG\SYSTEM
C:\WINDOWS\SOFTWAREDISTRIBUTION\EVENTCACHE\{2345A899-6421-4B9B-9BD5-BDA4293AF89C}.BIN

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Options
Scanning engines:
F-Secure Libra: 2.4.2, 2007-09-25
F-Secure AVP: 7.0.171, 2007-09-25
F-Secure Orion: 1.2.37, 2007-09-25
F-Secure Blacklight: 1.0.64
F-Secure Draco: 1.0.35, 2007-09-17
F-Secure Pegasus: 1.19.0, 2007-08-19
Scanning options:
Scan defined files: COM EXE SYS OV? BIN SCR DLL SHS HTM HTML HTT VBS JS INF VXD DO? XL? RTF CPL WIZ HTA PP? PWZ P?T MSO PIF . ACM ASP AX CNV CSC DRV INI MDB MPD MPP MPT OBD OBT OCX PCI TLB TSP WBK WBT WPC WSH VWP WML BOO HLP TD0 TT6 MSG ASD JSE VBE WSC CHM EML PRC SHB BAT LNK ANI AVB CEO CMD LSP MAP MHT MIF PDF PHP POT WMF NWS TAR TGZ WSF ZL? {* ZIP JAR ARJ LZH TAR TGZ GZ CAB RAR BZ2 HQX
Use Advanced heuristics

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Je comprend rien a tout ce charabia, quelqu'un pourrait il m'aider et eclairer ma lanterne ?? es ce bien un virus que faire s'il vous plait ??? Merci d'avance bonne soirée a tous

Thierry