This is an old thread, but I know it likely is still hapening to a lot of folks.
We've had this common problem off and on for years now with our Xerox copiers and the Xerox print drivers that are installed via our Windows print server onto the client PCs (our users have no permissions to install printers themselves). The problem directly stems from the Dependent Files registry entry for the print driver being blank or corrupted on the Windows client PC (Windows 7 64-bit), but I don't know why this registry glitch happens.
When it does happen (and I'll usually get 3 or 4 users a day having this problem), I have a 60 second fix that I do on the client PCs to make them ready to go again (until the next time it happens):
1) Remove the Xerox copiers from the user's list of printers on their PC.
2) RunAs REGEDIT.EXE as an admin user.
3) Delete any Xerox print driver keys that you find under HKLM\System\CurrentControlSet\Control\Print\Environments\Windows x64\Drivers\Version-3
4) RunAs Services.msc as an admin user.
5) Stop and Start the Print Spool service (or reboot the PC and have the user log in again).
6) Now re-add the Xerox copiers for the user (or you can set up a GPO to automatically add the Xerox copiers when the user logs in).
Printing to the Xerox copier should work now.
I have been able to apply this workaround remotely too, but the user then has to reboot the computer and login again and then manually re-add the Xerox copier(s), unless you use a GPO to automatically add the copier(s) at login.
