I think I might have a virus on my computer?

My internet explorer and Microsoft inbox keep freezing saying 'not responding' and then it's hard to close them down. It's only started doing this in the last few days. I've gone through my programs and deleted anything strange. I've also run norton but it found nothing. Is it a virus do you think?

If your NAV is up to date, then its unlikely to be a virus. It could, however, be spyware which NAV doesn't pick up. You might try reinstalling IE or maybe upgrading to IE 7 or trying an alternative browser and e-mail client.