Computer lag, now cannot open windows
Recently ive been having a few lag issues with my new computer. Just last week, whenever I would run Warcraft, BF2, or even just watching a movie on Media Player, the computer will start lagging in intervals. Eventually these intervals become shorter, and the computer just freezes all together.
Few days after, it became so bad that my computer would no longer load windows fully before it automatically restarts. I managed to reformat the HD, and it ran well again for several days and happened again yesterday. I can no longer load windows properly.
I ran a Maxtor HD test, as well as a Memtest86, and everything passed. I am running out of ideas. Could it be a Video issue?
Any help would be of great help.
Thank you in advance.