My computer locks up randomly. I could be playing a game or browsing. When this first happened I was using win xp. At first everything ran smoothly for weeks on end no problems. Then it started crashing...... I upgraded to win 7 and it ran smoothly again for awhile... then it crashed yet again and it keeps doing it from the first time on... it also seems to be accuring more often over time. I attached the dxdiag for those who want the specs... The temps are great. I am stuck. Memory checked out okay. Have not found any viruses using 3 different antiviruses to check. Norton, Avast, and Microsoft Security Essentials.