I believe you may be following the wrong trail, Kolo.
The OP was able to boot into Windows 7, before he followed your suggestion cocerning changing the designators. The problem was an incomplete boot up.
My own plan would be first
Backtrack both of the registry changes you have made, and change them back to the original.
Try a start up, in Windows 7, in safe mode, and opt to log on as Administrator.
If you are no offered that option, but can get on to a desktop, open RUN and type in Control Userpasswords2
In the window, select Advanced and then advanced again in the next window.
Select users and then Administrator.
In the next window, untick the square "Account is disabled"
Back out of the windows.
Now log off and you should find the opportunity to logon as the Administrator.
By either of these methods above, you should now be the global Administrator. and, hopefully, have a full desktop. If not, I am afraid it is back to square one.
Now go to user Accounts in the Control Panel, and set up a new user.
Log off and see if , with a logon as the new user, you are now back to normality.
Having burbled all that. I am pessimistic as to whether it will work, but it certainly will not, at this stage, alter anything you have. It does look as though you have corrupted your OS during the Shrink/Expand.