First things I would do:
1. Clear each browser cache
2. Clear all .tmp files - start > search > for files & folders > all files & folders: type ".tmp" without quotes.
Delete everything that comes up in that window.
Don't worry, they are all temporary files, but malware could be using .tmp extension.
Also check and delete:
C:\WINDOWS\Temp -
folder contents only
C:\Documents and Settings\PC name\Local Settings\Temp -
folder contents only
3. Try booting into safe mode:
http://www.howtogeek.com/107511/
From the sound of things, you are already at that stage anyway?
If you get into safe mode, problem still present?
4. Hmm... happens in all browsers?
https://www.google.co.uk/#q=black+browser+windows+bug
Use google search term:
black browser windows bug
and add your graphics chipset, or driver version, or even both together.
See what comes up.
5. As others suggested, try system restore.
6. To prevent this kind of thing in future, get this:
http://www.symantec.com/en/uk/produ...s/buy.jsp?pcid=pcat_business_cont&pvid=1601_1
Create a hard drive image and backup to DVD or USB stick.
Any future trouble, cloned image is restored in a few minutes.
Much better than windows restore.