Try disinfecting Ramnit with Dr. Web LiveCD.
Download and burn Dr. Web LiveCD to a blank CD from a non-infected computer using ISO Burner.
Follow these steps:
http://www.freedrweb.com/livecd/how_it_works/
I don't have any cds at the minute but would that definitely work? In the mean time I've been running various scans and I used ComboFix last night which seemed to slightly help. Microsoft Security Essentials had stopped working but after ComboFix it seemed to work again. I ran an antivirus scan today and it found 11 infected files but a full scan only took 15-20mins so I don't know if it is working correctly. I just did an MBAM scan and it didn't find anything?? Here is the log
Malwarebytes' Anti-Malware 1.46
www.malwarebytes.orgDatabase version: 4967
Windows 5.1.2600 Service Pack 2 (Safe Mode)
Internet Explorer 6.0.2900.2180
28/10/2010 15:13:29
mbam-log-2010-10-28 (15-13-29).txt
Scan type: Full scan (C:\|D:\|)
Objects scanned: 204626
Time elapsed: 16 minute(s), 17 second(s)
Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0
Memory Processes Infected:
(No malicious items detected)
Memory Modules Infected:
(No malicious items detected)
Registry Keys Infected:
(No malicious items detected)
Registry Values Infected:
(No malicious items detected)
Registry Data Items Infected:
(No malicious items detected)
Folders Infected:
(No malicious items detected)
Files Infected:
(No malicious items detected)