|What error does it give you when you attempt to connect? Have you tried using the standard Windows connection diagnosis tools? The error should give you an idea of whether it's a software related problem, or whether an internal component of the actual system has blown.|
Internet connections failing can be down to anything from viruses to faulty IP settings.
My first instinct would have been the firewall but it seems as if you've disabled that.
The Definitive Guide to Registry Cleaners &