I have a Windows Vista laptop that had a Koobface Worm infection. I used MalwareBytes to clean it. After a half a dozen passes it tests clean of any malware. I also tested using MS Malicious Software Removal Tool and it tests clean also.
When I got the machine the PC-cillin's last definitions update was in early March. When I tried to manually update it, it gave me an information screen that said "The feature is still loading. Please wait a moment, and then try again", and would not update. After I cleaned the worm with MalwareBytes, I eventually was able to get the virus definitions to update.
After that, everything appeared to be normal. An automatic scan from PC-cillin started and I was about ready to return the laptop to it's owner. I figured I'd run one last scan using the PC-cillin, but when I started the scan I was getting the same "The feature is still loading. Please wait a moment, and then try again" error when trying to manually start a scan or manually trying to do a definitions update. There appears to be no trace of infections that I can detect through MalwareBytes, MS MRT, or HijackThis, but the Trend Micro PC-cillin is not working as it should. I am attaching files for your inspection... Any ideas?