Re-install the printer this way. Use the patch to completely remove the printer. The dll you're looking for should be included in the new drivers.

 

 

Disconnect your printer. Go to start/programs/Dell printers and un-install your printer. If using Vista, go to drivers and downloads and download the patch and install the patch. This will remove the printer and files. Be patient. When done, it should prompt you to restart your computer.

Restart your computer.

Now go to drivers and downloads/select product/printers/select your printer. Download drivers and firmware.

Install your printer drivers. You'll be prompted when to connect it.

Then install the firmware.