Depending on the make of your pc you may have a recovery partition to restore from, or you can purchase a set of recovery disks from the maker.
As you havn't given us any information regarding make and model, if it's a brand name or home built, it's not possible to say more.
Like Jonmor68 said, more information is needed to help you with recovery discs for Vista. If your version of Vista is an OEM version that came pre-installed on a laptop that you purchased, you are likely able to purchase a recovery disc from your laptop manufacturer (ie: Dell, HP, Sony, etc.).