Kaspersky Labs has developed a free removal tool for Sasser, which will delete all traces of the worm from the system.
Clean your computer now
Kaspersky Lab, a leading information security software developer, now has a free utility to remove the network worm Sasser. The utility can be downloaded from http://www.kaspersky.com/removaltools.
This program will detect active copies of the worm in computer memory, deactivate the copies, delete infected files from hard and network disks, and restore the Windows system registry by deleting the link which Sasser creates to itself. In addition to fully restoring the functionality of the infected machine, each time the program detects a copy of the virus, before deleting the file, it will display a reminder to download a patch for Windows to close the vulnerability used by Sasser. The patch can be downloaded free from the Microsoft site.