Ran uninstall on AVG and Security Essentials.
Ran AVAST uninstall utility.
Installed AVAST, again.
Same results. Invalid file signature.
Ran Mbam full scan:
Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.orgDatabase version: 5378
Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702
12/22/2010 5:52:50 PM
mbam-log-2010-12-22 (17-52-44).txt
Scan type: Full scan (A:\|C:\|D:\|)
Objects scanned: 187737
Time elapsed: 38 minute(s), 33 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: 2
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:
c:\documents and settings\owner\local settings\temporary internet files\content.ie5\enmuop8v\profile1[1].gif (Extension.Mismatch) -> No action taken.
c:\documents and settings\owner\local settings\temporary internet files\content.ie5\enmuop8v\right-gutter-bkg[1].gif (Extension.Mismatch) -> No action taken.
Quarantined those files.
While the scan was running I got a pop-up that said the firefox file was corrupt, and to run scan disk.