During Windows 7 install, you will be prompted to enter your user name. At this point, DO NOT ENTER anything yet. Bring up a command prompt (Shift – F10).
In the command prompt, copy the user directory from your OS HDD (C: I assume) to your storage drive (D: I assume). Then delete the original directory.
robocopy „C:\Users“ „D:\Users“ /E /COPYALL /XJ
rmdir „C:\users“ /S /Q
Then make a symbolic link.
mklink /J „C:\Users“ „D:\Users“
Open up the registry editor (type regedit in your command prompt window)
Change the locations of all the default user profiles from C: to D: located in this profile list key: