Remove Dell wallpaper during RDP sessions

Open regedit and go to:
Hkey Users
Default
Control Panel
Desktop

locate and delete the registry entry for wallpaper!!

(entry should point to dellwall.bmp)

Remotely enable RDP on workstations

By GPO:

Computer Configuration>
Administrative Templates>
Windows Components>
Terminal Services>
Allows users to connect remotely using Terminal Services

By editing the registry of said machine:
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server
fDenyTSConnection=0