Avast fail: it report cgminer as a virus. And i don't find a way to tell it to ignore it. Avast double fail.
Yeah, they don't make it easy override avast. Make sure everything is set to "Ask" under your "Expert" File System Settings. You can also add exclusions there also.
If you just do a normal install and leave it, Avast will just make shit disappear without asking or notifying you. That's pretty fucking annoying. Same with most anit-virus programs today. Just imagine if any other software type acted like that, your PDF reader just decides to disappear your MP3 files...