Lynn has a desktop computer that had viruses, and she took it in to a repair shop to get it fixed. Leo suspects they didn't wipe the computer and reinstall Windows, which is the only real way to be sure the computer is clean.
Since her computer is freezing requiring her to force shut it down and restart it. It's crashing so hard that it isn't even giving her a "blue screen of death." Leo thinks this is a hardware problem, and that could be hard to diagnose. She said the place she brought it to suggested it could be the wireless mouse she's using, or even that it's next to a telephone. Leo says that's crazy, and shouldn't have anything to do with this. She should bring it to a different place to have it looked at.
Going back to her original question, no, her computer shouldn't be obsolete after 4 years. It should be fixable. She should get Windows reinstalled, and upgrade to Windows 7 as well. She should get the power supply checked, and also open up the tower and clean dust out of the fans because it could simply be overheating.