It does seem that Microsoft may be having similar issues with the Vista to Windows 7 upgrade route as the did with the XP to vista route.
Sometimes it works fine - most of the time an upgraded install will have the some issues that are not present with a clean install.
This is Pre-Beta so hopefully this will improve.
I'm sure if a fresh copy of vista was updated to windows 7 everything would be straightforward, but in the real world I would always advise
New OS = Clean install
And with a pre-beta you always need another OS for a worse case scenario, and keep your data separate and backed up
just my opinion
PS Just noticed - Congratulations Shawn - 500 posts
, and I'm sure that's only the start