"About:blank" is not always an easy bit of spyware to clean out. What have you done to clean it up? Have you tried running the clean up tool below?

ABout:Buster
http://www.majorgeeks.com/download4289.html

Have you tried running HijackThis and posting the log at one of the forums listed in the link below?

How to use HijackThis and where to post the log.

If you KNOW that its' now gone, please try running the LSPfix utility from the link below. It might fix the connection issue:

Repairs Winsock 2 settings caused by buggy software or improperly removed internet software:
http://www.cexx.org/lspfix.htm

Hope this helps.

Grif