Printer Driver Issue Windows 7

Hello,

I'm having a problem when trying to distribute IP Printers. Below is my configuration:

Desktop Central Server running on Windows 2008 R2
Printers: HP LaserJet 4000 (with HP Universal Drivers) and Dell 1815dn MFP, shared through Windows Printing Service
Clients: XP and Windows 7 (64 and 32bit)

After I distributed the Printers through DesktopCentral it worked like a charm on all XP machines. Though on none of the Windows 7 PCs they got installed. I get the error:

"Driver Installation Fails: Access is denied"

And the following in the log "computer.log" on the W7 clients:

[ 2012-03-26 00:37:22:850 ] [ 2992 ] [ERROR] GetProcessToken : OpenProcessToken Failed with error:: 5
[ 2012-03-26 00:37:22:850 ] [ 2992 ] [ERROR] ExecuteInSession : Unable to get the Process token .
[ 2012-03-26 00:37:22:850 ] [ 2992 ] [ERROR] Error Code : 5 , Error Message : Zugriff verweigert

"Zugriff verweigert" -> "Access denied"

The printers are shared with "Everyone". UAC and Firewall is disabled on the client.
Has anyone had similar issues? Help would be highly appreciated.

Cheers,

Philipp