3dsmax5

Okay, my old processor ****ed up, so i bought a new one(p4 2,53ghz) anyways… now my 3dsmax makes my computer REAL slow and i mean big time slow. What i’ve noticed is that one process (called “winlogon.exe”) takes up about 50-60 % of my CPU and i have to restart the computer so it can work fine again and this winlogon stuff only starts after i loaded the program… what’s wrong? I sure can’t figure it out!