Hello,

We have identified a resoltion for some of these reboot loops.  Please see the steps below for details:

We will start by booting into Windows Recovery Environment using the same steps above.  I will list them again here for completion's sake:

1.    boot using the Windows 7 installation DVD
2.    Choose your language settings and hit "Next"
3.    Click on "Repair Your Computer" link at the bottom of the screen. This will launch Windows RE.

NOTE: Do not click on “Install Now”

4.    Choose the OS to repair, and take note of the Drive Letter assigned to the operating System.
5.    You should see “Windows 7” and D:\ (the drive letter may be different)
6.    Click Next and you should see a list of the recovery tools
7.    Click on “Command Prompt”
8.    You will see “X:\Sources” in white on a black background, you can type commands here

Once you have booted into WinRE please follow the steps below:

1. Type "cd c:\users" at the command prompt. 
2. Type "dir /s /p", and look for the words "is too long".  
3. If you don't see "is too long" on the first page, press a key to get the next page 
4. Look on the second page for "is too long".
5. Continue to press a key to advance in pages until you find all the strings "is too long". (This may take quite a few pages to get to the end)

NOTE: You may see more than 1 entry that has "is too long", please take a note of each entry as we will need the folder names in later steps.

Once you have identified all the folders with "is too long" we will need to move them into a temp location.

7. Type "move" followed by the path of the folder, then the name of the temporary location to move to:

EXAMPLE:  MOVE C:\USERS\BOB\DOCUMENTS\DOCUMENTS C:\TEMP

8. Once all the invalid folders have been moved, repeat step 1 and 2 to verify that there are no other folders with "is too long"
9. Once completed, restart the computer and you should be able to successfully boot into Vista.

10. Once back into a working Vista, open "Computer" and navigate to C:\Users and open your username folder.
11. Right click on each folder one by one and choose "Properties".
12. Click on the Location tab and confirm that the path shown is correctly displaying the path for this folder.

Example: The properties / location of C:\Users\BOB\Documents should have the same correct path listed on the location tab "C:\Users\BOB\Documents". 

13. If any folder's location is not correct, click on "Restore Defaults" and repeat
14. Once all the folders have been corrected, please reboot the computer and retry the upgrade process again.

I have unlocked this thread, please let me know if you see success with the above steps.

Thanks!