I have a Dell Studio 1735 laptop 17 inch that came with Vista Home Premium. I updated Vista to Win 7 Ultimate with no problem. The PC came with 320gb sata 2.5 HDD and 4gb of ram. I put another 320gb sata 2.5 HDD so I could install win xp pro OS on the second HDD. The computer is reading both drives in Computer and Bios. While trying to install win xp pro I get an error message, Quote: The computer is shutting down to prevent it from being damage. The new HDD has being formatted and install correctly. Where the first HDD is in C:, the second HDD is in F:. Question: Is it possible to have two operating systems on two different HDD on one laptop. I don't want to partition the first HDD and put 2 OS on one HDD and when I boot, will I have a choice on which Operating System I want to work with? HELP!