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BitDefender Antivirus
Kaspersky Anti-Virus
Trend Micro
Panda Antivirus Pro 2009
Norton AntiVirus
Avira AntiVir
Microsoft Security Essentials
ESET Nod32 Antivirus
AVG Anti-Virus
McAfee VirusScan Plus
Avira Antivir Personal Eddition - Free Antivirus 9.0.0.403
and for spyware I Use Super Ant-Spyware 4.26.1004
Avast. In my case it works for long time without any troubles. The same with Win 7 (7100 RC, x32).
Avira AntiVir Premium Security Suite! That's all!
In Windows 7 I use: Microsoft Security Essential Beta, Kapersky 8.0 Beta for Windows 7
In Vista I use: Trend Micro Internet Security Pro 2009, and an occasional Scan with Windows Defender
Microsoft Security Essential Beta and Malwarebytes