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In the past I thought with a OEM version of Windows you could only install it on one system and if you change some things in that system the license became void? Well now that I put a new mobo in my computer I tried to install XP. The activation failed and I was forced to call Microsoft, but they just activate it again for me.

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Actually that's quite normal. Whatever you do just keep asking for a new license, it's insane that you'd need a new license when all you're changing is a 3D card or mainboard. In fact, technically it's still the same system, so it's not like you are doing anything wrong, it's just how the activation system works,

Cheers