I just got my new Sapphire Radeon HD6670 graphics card. Along with it I got a new power supply unit as the card required minimum 400 watts. (My computer's stock PSU was 220W) The PSU I got is a Rosewill RD 500-2SB. (500W) So I put in all of the new hardware, booted up the computer and put in the video card driver install CD. About halfway through the driver install my computer froze up. Now I can only log in under safe mode. If I try and start Windows (7) in normal mode when I get to the log-in screen I can't do anything. Frozen curser and the mouse arrow won't move. What can I do? Any help appreciated. Thanks!