Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Control\Print
Name: SchedulerThreadPriority
Type: REG_DWORD
Value: 1 Above normal priority
Value: 0 normal (default) priority
Value: ffffffff Below normal priority
Restart the computer or restart the Spooler service to make the change take effect. To restart the Spooler service, type the following at a command prompt:
net stop spooler
net start spooler