Just as I get my desktop to work my laptop decides to act up. I had trouble installing SP1 on an Acer Aspire 6935 with Win 7 Home. I downloaded a utility to help install it and it seemed to work. However now I can't boot. The screen goes to 'starting windows', then a black screen where my mouse works, and seems to do nothing else . I've left it like that for over an hour collectively. BIOS was telling me to repair the install and this wasn't working as the screen kept asking me to repair. I used a repair disc and that seems to have made the repair notification go away. But the screen hasn't changed. How do I fix this?