I bought my computer in 2004 from Best Buy. It came with windows xp pro installed but the product key on the sticker is for windows home. It is out of warranty.I believe this is causing validation to fail.If i backup my system and use the restart disk changing from xp to home will i be able to restore to it. I would like to be able to make everything like it is now so i do not end up in a worse situation then i am in now.I could get rid of the message popping up that says i may be the victim of software counterfeiting. But would still have the problem of not being able to get updates.