Windows 2000/XP/2003/Vista. This is the Spooler service which manages all fax and print jobs. Spooling is the process whereby the PC first outputs a print job to a temporary file on the hard disk, a process which completes infinitely quicker than actually printing, and then printing the job thus allowing the end-user to continue with his use of the PC while the job is printing.
An integral part of the operating system, leave alone. You will not be able to print if you terminate this background service.
That is from this ---
Task List Programs
This XP service is running in the background even when you are not using your printer.
See if Windows Safe-Mode works. This option uses a minimal set of device drivers and services to start Windows. And has alot fewer Processes
running in the background.
If you are in there, Virus and Spyware scans are likely to work better in Windows Safe-Mode.
Try System Restore to a date when all was good.
Start >All Programs >Accessories >System Tools
Using System Restore too many times can cause
more harm than good. After doing a restore
that does not fix a problem, then UNDO the
Restoration, and try another restore point, or
just do the UNDO.