Since last night there was a version of AIMFix up for download which will unintentionally quarantine Explorer.exe because of a typo in the definitions. This is fixed in the current version. If you ran into this problem, go into the aimfix_quarantine folder on the Desktop and copy the explorer.exe.bak file to C:\Windows\explorer.exe and the system will be back to normal.

If you're interested in the details, basically there was a registry key used by a virus that called itself "shell" and placed itself in the Run entries in the registry to launch a malicious executable. A typo caused this to be removed from the Winlogon startup key instead of only the Run key sets, thereby causing the quarantine of explorer. I fixed the typo and the new version has been tested to make sure that the problem is resolved.

Sorry for the inconvenience, I am working on a new test system for AIMFix to try and catch more of these issues before releases are made, but bear with me in the meantime.

-Jay