fallback

Hello,
I have a issue.
I had implemented in registry-key of the my server (S.O. Windows 2003 R2
SP1), these four key:

strValueName = "FallbackPclDriver"
strValueName2 = "FallbackPsDriver"
strValue = "HP DeskJet 550C"
strValue2 ="HP Color LaserJet 5/5M PS"

I create these key in:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Wds\rdpwd

but if I have log-on in the terminal server, the printers of my client are
not create in terminal server session.
while if I define the user in group administrators of the terminal server
and execute the log-on the printers are create.

I don't want define all users with autorization of Administrator. what can I
do?

sorry for may bad english,
thanks