Hi, could anyone help me. I usually format for friends their PCs. This hasn't been a huge problem before SP2 but now I'm getting all sorts of problems. This problem is for both XP Pro AND XP Home as one laptop has a COA for Home and the other laptop has one for XP Pro. As the laptops did not come with recovery CDs, I've had to use my own. I tried checking if their is a hidden partition on the laptops to see if it had the oem restore but both do not have it. My first problem is that I can install Windows XP Home SP2 onto the laptop using the bottom COA serial but once I boot into Windows and it asks to activate, it fails. I tried internet activation but it doesn't work. I then tried the automated telephone activation and it said it couldn't activate it either. I then gave up and tried working on the Windows XP Pro on the other laptop but when I tried using the COA serial for that during install, it said it was invalid. I was using OEM versions for both Windows installation, could that be a problem? The HP Pavillion ze2308wm had a COA for Windows Home and the Dell Inspiron 700m had a COA for Windows Pro. Are the COAs for retail versions of those? If they were, why does it let me activate during install for Windows Home but when you get to the Internet/Phone it doesn't work? Will I need to call up again and talk to a live representative? How would I go about doing that for the Pro version since it doesn't give me one of those long 50+ digit numbers since it says the key is invalid during install. These laptops haven't had much changed from them either by looking at the specs on the sites so it can't be because of too many hardware changes. Both are out of warranty as well. If I were to use SP1 Windows CD and slipstream SP2 onto it, would the serials work then as maybe those serials are only for SP1? Okies I have been reading over the pre-activate Windows thread. I do have I think is a royalty oem key as when I was using Belarc Advisor, it showed the Windows key being different from the COA one. The only problem is I never realized you could do pre-activation and have already formatted the PC. Is it still possible to use the key? If yes, what would I need to get it working? This is for Home as Pro only had a COA key. Thanks for any help, it is appreciated.