Ultimate Virus Killer Looks Good

Ultimate Virus Killer looks good and very versatile. Portable and uses third party scanners.

Additional list: (some can be accessed through UVK)
Kaspersky Rescue CD
Panda Cloud Cleaner Rescue, 
Malwarebytes to clean up any malware thats left behind, 
TDSSKiller for removing rootkit, if there is any on the system, 
ADWcleaner to remove the nasty toolbars, adware and junkware from the system. 
Roguekiller
Microsoft Malicious Software Removal Tool