Windows 7 re-install - reestablish existing My Documents location on separate partition

"You could test the process with a different account and see if it works and doesn't wipe out the contents of the existing location.

To be safe, you could rename the old location to something else, point your My Documents to the original name of the old location (allowing it to create it), then just move all the contents from the ""something else"" folder to your new My Documents. No need to worry if it will wipe out anything in the move."