Often the best way to "clean" malware from systems is to run scans in safe mode. Some malware attach themselves to system files and can't be easily removed under normal windows operation (since the effected windows files are "running" ).
Boot into Safe mode With Networking, and carefully open IE (since active X is required by on-line scanners). Then run one or more of these free scanners:
Some excellent and free on-line scanners: (Note: Most are active X based, thus requiring IE to run - but worth it!)
1.
Online Scan
2.
Trend Micro HouseCall - Free Online Virus and Spyware Scan - Trend Micro USA
3.
Free ESET Online Antivirus Scanner
4.
http://www.ca.com/us/securityadvis [...] /scan.aspx
5.
http://www.pandasecurity.com/homeu [...] tivescan/? (Haven't used Panda in a few years - but it used to be good)
6.
Windows Live OneCare safety scanner: Free online tool for PC health and safety (Haven't used the MS onecare scanner - just know about it)
7.
Best Online Anti-Virus Scanner & Free Virus Scan - Kaspersky Lab
Be careful not to browse the net in safe mode as your other protection (AV, Firewall, etc) will be disabled.