you might think about downloading a Ram test program to test the ram you have for errors.
lotta times when the computer randomly reboots often it can be a ram error. that and when i search for that first group of code on google, a microsoft site says it describes RAM issues.
so if you run the test, and you get errors, you could take out 1 stick of ram and run it again with the other(s) and try repeat, try and find the ram thats giving the errors, if it runs through the test for a while with no errors, then its something else.
http://www.memtest86.com/