Hello guys, I am having a problem with my dell computer OS system. It is XP pro and the hard drive went out in my computer and I replaced it. When I tried to reinstall my OS it only gives me a 30 day trial and then cuts off, so I now have reinstalled it. I called dell and they told me they could not help and that it was a microsoft problem to contact them. When I tried to register the OS on-line it gives a phone number to call and when I call the phone number they told me to buy a new OS system. Why? Is this right? I have a OS system already and I have the regestry number for the OS on the side of my computer so why would i have to buy another OS? Is there any way you guys know of to get this thing to work? I thought when you owned the OS and had the serial number with it that it would work why in the world do i need to buy a new OS. It is not on any other computer at all and came on this one. Thank you for your time and help on this.