Have you tried rolling back to an earlier Restore point?
Basically keep tapping F8 on system startup (On some systems you get the Drive Boot Menu first. Just select which is your boot drive and "Enter". Then keep tapping F8 instantly) Then you should get to the standard Windows Boot menu. There should be an option for "Last Known Good Configuration". May have to try it a couple of times but hopefully that should roll back to before the "Windows Update" you mentioned.
Let us know how it works out. And good luck