I've had CoD MW3 installed on my PC for a few months and I've had zero problems with it. Last week I installed the Quake and Doom series on my computer. Now when I play MW3 the game constantly lags and is impossible to play. I read somewhere that MW3 is based on the Quake 3 engine -- is it possible that the Quake series I installed over wrote MW3 files with original Quake files or Quake or Doom installed something that is conflicting with MW3?
OS: Windows 8 64bit Mobo: GIGABYTE GA-Z68AP-D3(R2.0) Graphics: EVGA GeForce GT 640 2GB 128-bit DDR3