McAfee is really annoying when you try to play fgunz or do other stuff. it just randomly deletes sht and blockes things that are not dangerous at all -_-. so here's a tut to do stuff if McAfee is pissing you off.
1. open McAfee and select: "realtime scanning".
2. Select: "settings for realtime scanning".
3. Select: "shut off"
4. do 30 minutes (or the time that you are going to play) and then click on shut off.
5. close and play. dont forget you compress you laucher so if McAfee deletes it you can simply unpack it back in your game folder.