Just lately my computer has been struggling to play Skyrim, Assassin's Creed: Revelations and other recent(ish) releases. It usually crashes 20-30 minutes in, however reducing the resolution of the game (down from 1920x1080) or playing in a window seems to extend the time I can get before a crash. Additionally, not all the time does my computer even get to the blue screen, it often freezes, becoming totally unresponsive to any commands, whilst playing a loud buzzing sound, requiring a manual restart. As the title suggests, I'm not sure if it's simply overheating, or if it's something more.
Currently, my specifications are:
Windows 7 Ultimatex64
6 GB RAM
AMD Phenonm II x4 965 3.40 GHz
Nvidia GeForce GTX 560 Ti