Well, i was playing World of Warcraft today, and randomly everything started lagging pretty hard, so i restarted my cpu, and now i can't even been on for 5 minutes without the computer freezing up completely.

First suggestion is run antispyware,sounds like you may have got a virus or a spybot,secondly if nothing is located, run a scan disk on your hard drive to check the integrity of your OS'S files Hope this Help's Steve

If you keep reset on to your CPU this will affect to your Hard Drive. When your online games WOW very lag then do not let that online game on play to your Computer. You know or maybe your Computer are not enough to run this game. Check all the plug in play device which are capable to run this game. Your VGA Compatibility e.i AGP or PCI-E, Memory speed e.i DD1, DD2 & DDR3 and mostly Games Accelerator Programs.
Hope this tip might help you.
Good luck!