Run HWMONITOR from CPUID (free, google it) to record max temp. This could be thermal issues.
Software problems can do this. Run DXDIAG to see if directx can run. http://en.wikipedia.org/wiki/DxDiag
Download and run a diagnostic boot (google ultimate boot CD). Check memory. Check CPU. Mostly you are trying to load the system and see if it will fail. If it does it's probably a hardware problem. If not then suspect software.
Driver problems can do this. Uninstall your current driver and then dowload and install the latest video driver. You have an integrated ATI Radeon™ HD 4200 so goto AMD for the driver. P.s. if you have not added a video card then you should if you game.
Power supply as noted above can do this.