SOLUTION: Stuck documents in the print spooler on Windows
If there’s a document stuck in your printer blocking the print spooler of your Windows and refuses to go away no matter how many times you click “Delete”, there’s a more effective and convenient solution than unplugging the printer or restarting the PC. Just copy and paste the following lines in the notepad and save them with .bat extension (or you can also click here to download the file):
net stop spooler
del %systemroot%\system32\spool\printers\*.shd
del %systemroot%\system32\spool\printers\*.spl
net start spooler
Now double click that file and the stubborn stuck document will go away.
Via: gHacks