Moved to Corporate malware assistance
Read this and try the suggestions then also try the free scanners mentioned.
Some of these scanners are
On infected PCs good to download their setup files to your desktop but rename them to MW.exe and say Sup.exe. This allows them to sneak past malware looking to deactivate scanners. When you install them do so to a non standard folder ie do not accept default folder and once installed update them. Ensure which ever way helps send the file to Mcafee labs it will assist others in finding it.