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Invalid copy of XP

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I recently (well, not so recently) had a new motherboard, cpu and hard drive installed in my computer. The problem is that I didn't give them my XP installation cd (XP Home edition) and they installed XP Pro from their own cd. Well now I can't receive any updates from MS because I can't validate the copy of XP they installed. Can I just do a repair using my OEM cd or is that not possible since the shop installed the Pro version and I originally had Home edition? Where do I go from here? Do I have to do a clean installation and if so, where can I go to get step by step instructions to do so.

Obviously, I'm not experienced with this kind of thing and greatly appreciate any advice on how to procede.
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Hi ferrous2...

IF whoever installed XP Pro on the machine did so as an upgrade, you may be able to return to the old version XP. IF it was a clean install of Pro, there is no way to revert to the older version and you will have to format and do a fresh install of XP Home...there is a good guide for doing that HERE.

Be sure to back up any important data to external or removable media before you format and reinstall Windows.

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