I have Toshiba Dynabook that I bought in Japan. It originally had Vista on it, but recently I yanked the hard drive out and replaced it with a new one and installed windows 7 on it. I installed all the drivers it required using driver max and windows update, but it keeps freezing randomly. I ran the disk error check and no change and I tweaked my boot up to only run needed programs. I'm pretty sure it's not an overheating issue because it will run for hours when installing the os. I've already spent more time than I wanted to invest in this and am ready to smash the computer. What else can I try?