Background: I used to fix PCs (hardware/software) for a living and still do regular work for friends/family/former customers - I've therefore seen 1000s of PCs with every manner of virus/spyware/malware and every combination of "Anti" product you can think of.
Obviously what I'm about to say only affects Windows users!!
Unless you are the sort of person who feels they are at 'heightened risk' of encountering '0-day' malware(you know who you are) - Microsoft Security Essentials (Windows Defender on W8) is all you need. That's advice I've given for years and it's yet to bite me (it'll happen I'm sure - but I'm OK for now!)
I've recommended other products in the past but the AV (paid and free) market is now awash with compromised products using dishonest techniques to try to 'sell' themselves to users whislt being ever less useful at what they're supposed to be doing.
Oh. what's that? Do I hear someone coming with those virus 'tests' which show that "X" is not as good as "Y"?? Save yourself the trouble - I don't care - in the real world those tests mean nothing. Out here in reality, people clicking the wrong things (or just being unlucky) will have bad things happen to them and NO software will stop that completely - meanwhile, the wrong AV software is slowing your PC, breaking your games etc.
As for running 'naked' - I sometimes recommend people with older PCs do that, it's a reasonable trade-of for them but it's obviously a risk. That said tho, all AV software slows your PC - the people who spend eons tweaking the PC will generally be delighted with the benefits you get from not having AV
End of the day, the BEST defence against malware is using your brain - no software can compensate for people who click those "FREE BEER HERE" links or open attachments from women wanting to marry them or whatever else it is people seem to love doing which stops their PCs dead (and 99% of it is porn or piracy, of course)
Bottom line for this thread - if AVAST is interfering with the game, DUMP IT - even if you decide to use another 'free' option or PAY for one, keeping an AV which is breaking legit software makes no sense...
p.s. if you really want to protect yourself, spend your time and money on backup solutions - backup EVERYTHING and OFTEN - then it doesn't matter what you run into because you can remove it effortlessly and you'll lose nothing in the process...