Depends on the printer but generally you choose PRINT from the file menu and it opens a pop up ... choose your printer, then click on PROPERTIES (for the printer, there may be mroe than one properties button) and this will bring up another pop up that lets you choose either "Whack and Blight,,, er, black and white" printing or "Grayscale" depending on the printer.
It might work.
If it works you have to do it EVERY time you print. OR.
You can also go to Start/Settings/Printers & Faxes and choose the printer driver there,, And set that as the DEFAULT printing mode.
NOTE: th is is the method for windows up to XP, I do not know about numbered versions that have come out since.