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.