I think I may have gotten it fixed. I believe the problem was from the AMD
Dual Core Optimizer program that AMD offers on their site. I had installed it
to see if there was a difference, there wasn't. I think that may have caused
all the recent problems I had. I'll let you know if it happens again. Thank
you all for helping.

By the way Carlos, I was thinking about changing the PSU, I might do it
soon, there are too many power cables in the case and it's very noisy.

Nevermind, I don't have it fixed, it just recently started happening again
after 5 days of having it under full control. What could the problem be?