It could also be that you have a Trojan on your system.
A wild guess would be this one: Trojan.Byteverify: http://securityresponse.symantec.com...yteverify.html.

Although, I havent heard that this trojan shuts down any browsers.

Try the recommendations listed in the above link: boot up in safe mode and do a full system scan.

Tip of the day: You should always boot up into safe mode when dealing with virii removal


Later

/Vigge