There are a few things you should rule out:
1) Overheating.
Install the open hardware monitor from http://openhardwaremonitor.org/downloads/
and run the .exe file. It will monitor the CPU temperature – check that it’s
not high (less than 70C is OK).
Open the computer case and physically clean out all dust,
concentrating on fans, grills and heatsink. Replace and re-check temperatures.
It’s surprising how often this can make a difference.
Stress test the PC whilst monitoring CPU temperatures. Play
a demanding game – or run the Prime95 torture test from http://www.mersenne.org/download/
- see if that causes any overheating problems.
2) Memory fault
Check the memory (run msched.exe).
3) Driver problems
Look at the the crash dump record (it’s easiest to use a
Blue Screen Viewer eg http://www.nirsoft.net/utils/blue_screen_view.html)
This will give a clue as to the cause of the crashes – it might
be a driver problem, which may be resolvable be reloading a device driver.
