How can I get rid of all the viruses they got on it then?
jesus
after the bios constantly tap f8 and select safe mode with networking.
http://malwarebytes.orginstall it
full scan it
quarantine the viruses.
if it doesn't work because stuff in safe mode, check the bottom of your laptop for a microsoft windows code (if desktop just look around) and don't tell us, instead go out and buy some blank dvds and go on a good computer and download an OS disc with windows vista home premium on it (tell me if malwarebytes doesn't work and i'll get you a link to a legit dvd without codes, that's what the microsoft certificate is for, to provide you with a product key, use the product key that's on the sticker.)
and boot from dvd to reinstall vista.
just have your drivers ready when you reinstall, because you don't have video drivers networking or any of the sort after reinstallation.
how you're going to get the drivers is your problem.