it's called, or not loosing the installation files from my PC. So my question is, How do I re-install my Windows Vista with out it becoming un-geniuin or w.e. So I have those.but how to access the installation window that appeared when I first booted up my PC when I brought it home.I have no idea. I dont know if it's on the hard drive or in another place.Seems impossible for it to be anywhere else.I have a sticker on the side of the PC case that states the OS version (Vista Home Premium) and the product key. I decided to re-install my Windows Vista.problem is.I dont have a CD that came with the PC. I bought a PC a while back.(atleast 3 years ago) and my system has been going downhill by slowly loosing more and more ability to function.