the computer is aboout 3yrs old and after upgrading from xp 32bit to win7 32bit and got a new graphics card with 512mb my computer keeps freezing. the freezing occurs usually during startup or a couple minutes after startup; it has no certain time to when it freezes. it also freezes in safe mode. it was working fine running on xp with the new graphics card. after freezing i cant control the mouse nor keyboard and everything lockes up with the display left how it was before freezing (no black or blue screens) things i have tried doing.. -reformating hdd -switching between 2 512mb RAM modules -using the intergraded graphics card -leaving win7 on w/no updates what could cause the freezing??