Don't know anything about the Sasser virus, but noticed yesterday BC has a self help removal guide that might get you started. http://www.bleepingcomputer.com/forums/t/3097/how-to-remove-the-sasser-virus/
Then if you feel you still need further help, you can post in the Am I Infected?
forum and one of the malware removal experts will help you as soon as they can. Remember, they're volunteers, so be patient.
Also, you could run the Microsoft Malicious Software Removal Tool (available with regular Windows Security Patches). I see it has Sasser on its list of malwares it detects/removes. If you're up to date, you should have the tool on you system. BTW you have to log on an Admin user account to run the tool. Click Start, Run, and then type MRT in the run box to execute a scan. I've never had it find anything on my pc, so I don't personally know how effective it is at completely removing malware.
Edited by buttoni, 20 April 2009 - 12:59 PM.
HP Pavilion desktop p6270z; 8 GB ram; Win7 Home Premium x64 bit; FX 4.0; DSL 2Wire modem/router; MVPS Hosts; Comodo FW 5.3(D+ & Sandbox enabled); MSSE; MBAM on demand.