Ok here's the deal, i have a toshiba protege 3500, im using windows xp tablet edition, i don't know how, it said my windows activation period had expired!!! When i accept to activate windows. I get a message windows is already activated!!! If i click th ok button it automatically logs me off!! Cant reinstall windows cause it says my serial is not valid(the one that comes with the laptop), i also tried an upgrade to windows xpsp2, legal copy, and it gave me the same error!! Any sort of help will be appreciated!!! Thankx in advenced.