MS04-011: Sasser "A" and "B" Removal Tools
While I hope no one needs this, here are several tools and techniques for removing the Sasser worm. All of these tools are excellent. I prefer the Microsoft Removal Tool instructions (listed first), which includes the MS04-011 security patch required to avoid reinfections.
Microsoft Removal Tool
http://support.microsoft.com/?kbid=841720
McAfee Stinger
http://vil.nai.com/vil/stinger/
Symantec Removal Tools
http://www.symantec.com/avcenter/venc/data/w32.sasser.removal.tool.html
F-Secure Removal Tools
ftp://ftp.f-secure.com/anti-virus/tools/f-sasser.zip
ftp://ftp.f-secure.com/anti-virus/tools/f-sasser.exe
ftp://ftp.f-secure.com/anti-virus/tools/f-sasser.txt
Before using the tool please read the disinfection instructions from 'f-sasser.txt'.
Trend Micro Removal Tools
http://www.trendmicro.com/download/dcs.asp
Microsoft - Manual Disinfection
To manually disinfect an infected system, first apply the Microsoft patch MS04-011, then use Task Manager to kill the "avserve2.exe" process, then delete the file AVSERVE2.EXE from your Windows directory and reboot.
Steps from Microsoft's site (includes test button and tools):
http://www.microsoft.com/security/incident/sasser.asp
Manual Removal steps for Technical Users
http://www.microsoft.com/technet/Security/alerts/sasser.mspx