About a month ago, my computer caught the about:blank virus. I removed it once and it worked for about a week. I used Avast to get rid of it. It came back and I don't know what I should try next. Is anyone familiar with this or has any knowledge of what I should do? Thank you!

Did you see this:

http://www.bleepingcomputer.com/forums/topic4210.html

If you still need help, let us know.
Regards,
John