You need to look more closely at your printer. Why ? Because Dell does not "make" printers! They have them made by other mfgrs (most likely Lexmark or Epson) and slap their name badge on the casing & boxen.......
If it is an Epson underneath, OS X already has built-in drivers for almost every model they make, if not, you can download the opensource ones called GimpPrint at
www.sourceforge.net
If it is a lexmark, chunk it & start over ! (or sell it to some silly windblows user

)