All my sofware is genuine - I think the reason they don't match is because 2 years ago a new motherboard was install but windows was re-install using my numbers - this is such a pain for users who are following the rules. Why make it difficult for us?
I too had a similar problem with the motherboard being replaced 3 times under warranty and the 3rd time it was replaced with an upgraded one because the same fault continued to occur. However, the validation simply told me that there had been significant hardware changes since windows was activated and I had 3 days left to activate it. I re activated it and it appeared to be OK so I'm keeping my fingers crossed.