I'm running off of Windows Vista on a Dell Inspiron 531S. I bought a Green Power WD Caviar GP HD that holds 500 GB yesterday, but I am right now unable to install it because the CD that was packaged with it only does it for everything up to XP. Vista is not supported, even though I have confirmed that it is Vista compatible. Internally, everything is hooked up as it should be, but the computer as of right now does not know it exists. How do I get the hard drive to register in the CPU?