glenn, i assume laptop yan kasi armada yan yung notebook model range ng compaq. usually 1 year lang warranty nyan.
out of warranty n b ? IMO, virus, faulty Harddisk, o kaya corrupt files due to virus na in most of the time. magagawa pa yan. the best siguro re-format and re-install ng OS. as far as i know laptops are more expensive to repair than pc's because of their
smaller size & sensitivity and the parts are relatively hard to find.