win XP

hey, just curios, I've been using this same version of win XP for a long time now (2+ years i think) and got all the service packs, automatic updates and whatnot, and it was alway's "authentic" but now all of a sudden it sais "you might be a victem of software fraud" (or something like that) though when I click on the bubble it still say's "Thank you for validating your copy of Microsoft Windows." wtf? how do I make the popup bubble go away on startup and on my windows bar becouse it's anoying (I don't care if it's an Ilegal route, the software is legit, so I'm not forking out an extra 200 for something I already have...)

any sugestions? (I already have linux, but win XP is my main OS becouse of my recording software)