what i like to do is use a hirens boot cd and use the password remover to take the windows password off. it is easy it walks you through the process quite nicely it works with xp through to win7. and also it comes with all kinds of other tools so help you get your machine back in top shape. if you do not know about this tool i definitely think its definitely worth a look. you can find it here http://www.hiren.info/pages/bootcd