I had Vista but I erased my hard drive I have no Vista Disk. My Laptop is a Gateway I also have a desktop also a gateway I have the OS XP when I load that disk in my Laptop it starts to run I get to the Set-up Screen press enter, I get the Licensing agreement I accept, then I get a sceen that shows existing partitions on this computer press C to create press D to delete then on the bottom it says Uknown disk- there is no disk in this drive. I press enter than I get a blue screen that say A problem has been detected and windows has been shut down etc.