My Windows 7068 to 7100 Upgrade Experience

I went ahead and upgraded my windows 7 x64 build 7068 to x64 build 7100 today and I now wish I hadn’t.  Call of Duty 4 broke, ATI Catalyst driver broke, and alot of my programs registry settings are missing.
I had a feeling I should just leave my 7068 alone because it was working fine.  [...]