Cannot start Win update on Win 7 64 bit

I have a Lenovo T61 laptop which came with Windows Vist 32 bit. I installed a new harddrive and more memory and installed Win 7 Pro, 64 bit. Now I cannot start up Windows Update. It tells me that my registration key is not valid even though I purchased it through NewEgg and MS rep states that it is valid. Not sure if this is due to upgrading to 64 bit from 32.
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  1. you are using the new product key that came with win7pro64? other than that are you sure there's no typo?
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