Are you running Prime95, the program that finds Mersenne Primes? If so, have you tried uninstalling and reinstalling that program? If you are running Prime95, then your processor could very well be starting to overheat as it is EXTREMELY processor intensive. Also, from the stop bits, it looks like your processor might even be starting to go bad (just from what I've read so far).
Please at least post back whether or not you are running Prime95. Thanks
For those who want to know about the great Mersenne Prime search, go to
http://mersenne.org/