Ok, sorry for the delay in responding -- I installed the hotfix and it has cleared up my issues in gaming. Now it only locks me out at the desktop, and it seems to be doing it frequently. Strangely, I found that if I log out, the monitor comes back on with the welcome screen, and I can log back in and everything will work fine. This is, needless to say, a pain in the buttocks. According to GPUz, I am running around 57 C at idle (which is where all my problems are). My PSU is a Corsair.