Print Spooler Does Not Delete Print Job Spool File
When one sends a print job to a printer, the print spooler may not delete the spool file from the C:\Windows\System32\Spool\Printers folder when the print job is completed, and the print spooler may repeatedly attempt to spool the print job.
The presence of the spool file does not prevent other print jobs from being spooled.
This behavior can occur if the print job's spool file has the read-only attribute.
To prevent this behavior from occurring, do not change the attributes of a spool file while it is in the C:\Windows\System32\Spool\Printers folder.
To work around this behavior, remove the read-only attribute and then delete the spool file from the C:\Windows\System32\Spool\Printers folder, as described below.
To remove the read-only attribute, right-click the spool file in Windows Explorer or My Computer, click Properties, click to clear the Read-only check box, and then click Ok.
Click here for more information on the related topic, on Microsoft Knowledge Base article at http://support.microsoft.com/kb/216221.