Hello Umpleby31, and welcome to Vista Forums.
It depends on what type of Vista you have.
If you have a OEM recovery partition, then you should be able to press something like F10 or F11 every second during boot until you get to your OEM recovery manager screen. From there you should be able to select the restore to a factory default installation option.
If you can post back the brand and model number of your computer, I may be able to post back a link to the OEM's website with more detailed instructions for your particular OEM brand.
Hope this helps for now,