My dell 968 printer wont print. I can use the computer to scan, or I can make copies. But when I try to print something the box that comes up and shows you the % that has been sent to printer stops at 45% and then nothing. This started Monday (9-20-2010) It has worked perfectly for over 2 years. I have deleated and reinstalled the printer, I have made sure nothing was in the printers que, and I have made sure its marked as default printer. I unplugged cables and restarted everything.

It sounds like you need to clear the print spooler.

If you have Windows XP,Vista, or Win7 try this:
go to START>RUN - in the OPEN box, type "taskmgr" (without quotes) you can also do a CTRL/ALT/DEL
when the task manager comes up,
go to the processes tab, and look for "spoolsv.exe"
left click it, and choose END PROCESS. it will warn you that ending it might cause instability. say yes or ok, its not a problem - you're going to restart it in a minute.

now, go back to the START>RUN box, and in there, type "spoolsv.exe" again without quotes

now try printing again - you should be all set

good luck!