I had the same problem using avast. I found three instances of 'Win32:Cycbot-KI [ trj ]. I decided to let avast do its thing and after restarting my computer I wasn’t able to open most .exe applications and avast was disabled. It was a little frustrating but i found a fix for anyone else with the same problem. [windows 7] Go to Start/Search and type CMD In the Search Results right click Command Prompt and choose Run as Administrator. In the Command Prompt type SFC /Scannow. Once it’s finished corrupted files will be repaired and your .exe’s should work once again. cheers.