Infecté par trojan

Bonsoir,
Infecté par Trojan dowload, trojan dropper et trojan lopad. N'étant pas une douée en informatique, je m'adresse à vous.
Comment puis-je m'en débarrasser ?
J'ai fait un scan avec bitdefender, voilà ce qu'il me met :

//-----------------------------------------------------------------
//
// Product: BitDefender 9 Professional Plus
// Version: 9.5
//
// Created on: 27/08/2006 19:55:46
//
//-----------------------------------------------------------------


Statistics

Scan path : C:\
D:\
Folders : 1597
Files : 59091
Archives : 859
Packed files : 3614
Identified viruses : 3
Infected files : 3
Warnings : 0
Suspect files : 0
Disinfected files : 0
Deleted files : 0
Copied files : 0
Moved files : 3
Renamed files : 0
I/O errors : 26
Scan time : 00:28:04
Scan speed (files/sec) : 35

Virus definitions : 450995
Scan plugins : 13
Archive plugins : 39
Unpack plugins : 5
Mail plugins : 6
System plugins : 1

Scan options

Detection
[X] Scan boot sectors
[X] Scan archives
[X] Scan packed files
[X] Scan email

File mask
[ ] Programs
[X] All files
[ ] User defined extensions:
[ ] Exclude extensions: ;

Action

Infected objects
[ ] Ignore
[X] Disinfect
[ ] Delete
[ ] Copy to quarantine
[ ] Move to quarantine
[ ] Rename
[ ] Prompt user

Second action
[ ] Ignore
[ ] Delete
[ ] Copy to quarantine
[X] Move to quarantine
[ ] Rename
[ ] Prompt user

Scan options
[X] Enable warnings
[X] Enable heuristics
[ ] Show all files in log
[X] Report file: C:\Program Files\Softwin\BitDefender9\Logs\vscan_1156701346.log


Summary:

C:\Documents and Settings\Administrateur\Local Settings\Temp\MlusSetup-B.tmp Infected: Trojan.Downloader.Swizzor.EM
C:\Documents and Settings\Administrateur\Local Settings\Temp\MlusSetup-B.tmp Disinfection failed
C:\Documents and Settings\Administrateur\Local Settings\Temp\MlusSetup-B.tmp Moved
C:\Documents and Settings\Administrateur\Local Settings\Temp\msgpl_caaa.tmp\spinstall.exe Infected: GenPack:Trojan.Lopad.K
C:\Documents and Settings\Administrateur\Local Settings\Temp\msgpl_caaa.tmp\spinstall.exe Disinfection failed
C:\Documents and Settings\Administrateur\Local Settings\Temp\msgpl_caaa.tmp\spinstall.exe Moved
C:\Program Files\HbTools\HBTV\HBTV.exe Infected: Trojan.Dropper.VB
C:\Program Files\HbTools\HBTV\HBTV.exe Disinfection failed
C:\Program Files\HbTools\HBTV\HBTV.exe Moved