bzbuddy

I've encountered a big problem which my CPU usage will go to 80~100 percent... It will make me lag when im playing Warcraft 3 and Counter Strike Online.... Here's the big problem 1.While i watching my anime..i can hear the sound before the pictures come out 2.After 20~30 mins of gaming..my computer wil become dam laggy and than hang!I got to restart the com onli can play again 3.If i just on MSN and Internet explorer when i gaming..i will feel dam laggy.... IM using p4 1.6ghz,768 DDR ram,geforce 4 mx420 with newest drivers,windows XP service pack 2 Can anyone help me with this?

i already close everything.. i juz online and then go for gaming.. but it can't help after 20mins ~ 30 mins.. it will auto start to lag! Really dunno what to do about it ..and i already formated my computer before!