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#11
Yep, that's why the OEM is cheaper than a retail one.
Oh well. I've ordered a retail copy and it'll arrive before the trial period expires anyway. Thank you everyone for your help. I've learnt quite a lot from this.
The good thing that has come from this is I've thrown in some better hardware bits with no fear of 7 wanting activation ASAP because of any further hardware changes beyond the motherboard I replaced. Yay for Core 2 Quad!