Getting a blank white screen at Vista startup
 

The other day I came home and my laptop screen was 100% white except for the mouse pointer. Nothing I could do about it at all, control alt delete, alt f4, windows button nothing. So I held down the power button and shut it off. Tried turning it on and I got the same screen after it logged in. Tried it like 5 times and got the same thing. I restarted in safe mode and was able to get on, but can't get on the Internet. I looked online on an ipad for info and people are saying it might be due to antivirus programs, like AVG. I realized AVG 2011 probably installed without my permission so I tried to uninstall it in safe mode but it just wouldn't do it, just said it got some error. I tried to start it up normally again and after hitting a bunch of buttons I actually was able to get on to the normal desktop and when I went to uninstall AVG the computer just froze and I haven't been able to get on since. Also I ran a spyware and malware scans and they didn't do anything.

Still getting a white screen

Ok, the desktop loaded. But I still had the screen for a little. Gonna try to uninstall AVG and see if it freezes

Also the Portal logo on my desktop went from being an Internet explorer icon to the actual Portal icon, what's that about

Ghosts.

Reformat.

Yeah, sounds like your Operating System need a fresh reinstall. AVG is a great Antivirus, but I've been using a hacked version of Avast! for like 2 years now. It's quite good.