Cannot re-use retail Win7 Key

I'm trying to re-activate my retail copy of Win7 Home Premium but having some problems, due to my previous one dieing I've got a new motherboard which gave it the idea it's a new computer resulting in an 'unable to activate product' message.

Tried phoning up the activation line and that's telling me that my key is not valid for use on more then one pc, but I was under the impression that non-OEM keys could be re-activated as long as they were not being used on multiple machines at the same time.



Edit: Problem solved, tried the activation line again and it put me through to a person rather then just cutting me off, who kindly gave me an ID.

 

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