For quite a while we have had a GPO that sets the desktop wallpaper on all domain PCs. A few months ago we needed to install 64bit XP machines. These machines have the same GPO applied to them but will not set the desktop wall paper. By running rsop and gpresult I can see that the GPO is being applied to the machines, but the wallpaper is not being set. The GPO works perfectly with 100s of 32bit XP machines.