Not overclocked at all, but I just installed twice by making 2 changes.
1. Uninstalled Avira completely and rebooted. I've been suspicious of it for a few weeks now, since they put out that major update and redesign. Steam files have been coming up bad too, and I've run full chkdsk scans, memory tests, and virus scans with more than one program all coming up clean. I think it was Avira's realtime scanner.
2. Unzipped with Winzip rather than Winrar. Installed, worked the first time. Retried extracting it a few more times, worked fine. Tried again with winrar, ERROR. Reran hash check, good. Winzip works every time, winrar refuses to work at all. I'm running the 64 bit version of winrar if that helps.
Anyone have any suggestions for a good, free antivirus?