Wouldn't have thought it would be a virus preventing you from connecting to your wireless. If you could connect but not get webpages then I'd agree.
If you do think that - go to control panel, internet options, advanced tab, click reset at the bottom - tick personal settings too.
Also try going to start, run, type cmd - this will bring up a black window. Type in ping http://www.bbc.co.uk - see if that gives a reply. If it gives a reply then you are connected to the internet but just can't get webpages!