i need to download windows xp proffesional, what is preventing me from doing it is that someone did not activate the copy of xp that was in there and the windows activation program says it is not a valid copy of xp, when i turn on the laptop the windows activation screen once again returns and wont let my legitamate copy run and install off my disk, how can i get this laptop to run my disk ? toshiba sattelitte p205d-s7429. thankyou