Just bought a new Gateway desktop and for some reason …anytime we click on an application, no matter what it is, the computer just freezes up, requiring a hard reboot (turning off the computer at the powerstrip). It won’t let us do anything. We use the computer primarily for surfing the internet. Should I run the antivirus software and see if that cures the problem before taking the tower back to Best Buy to have them run a diagnostic or do you think that’s a bad idea? Thanks.