Hi forum, wondering if you can help please. I have a computer running on Windows Xp home edition i recently got it fixed because of viruses, now i got it back and a message saying you must activate windows in 30 days so I'm on 2 days left so I clicke don it and went to activate and it says "Invalid Product Key" now i typed the correct product key and the message still appears. is there something i can do. or do i need to take it back tot he shop.