OK well if you "blew up your system" and are "taking it to the repair shop" Then it is a hardware issue. Which means you are just swapping out parts. If you "blewup" the OS then why dont you fix it yourself. Changing you passwords on local accounts isn't going to help you. You have to give the PC shop a password to log into the system that has administrative priledges so...... as an admin they can "do anything" What OS was it 95/98/ME sorry you are SOL.... no security protection at all Is it W2K maybe a little. XP Pro.... try EFS.... Encrypted File System.

As for everything else. If you dont want someone to see it don't put it on you PC and let you PC out of your control... If you are giving up control REMOVE ANY INFORMATION YOU DO NOT WANT ANY ONE ELSE TO SEE. then of course of they really wanted to they could always to a data recovery on the HD and get all that information back too... But most likely you are not under FBI investigation so that won't happen...

So in the long run.... let me give you a peice of advice.... 80-90% of the system have pron on them.... How do I know. Use to do support for companies National Conventions.... we use to work on upto 800 laptops in a weekend.... didn't search them all but.... You get the idea.... We decide it was one of those lowest common demoniation things..