Q. Why did my old make engine stop working when I installed PBMake?

A. It really didn't. PBMake can create a file named MAKE.BAT. If you
   mistakenly run PBMake in some directory in the path, then MAKE.BAT is
   also available via the path. If the directory where MAKE.BAT is
   earlier in the path than your old MAKE.EXE, MAKE.BAT will run.

   Solution:
   Go to each directory in your path, and delete MAKE.BAT if it exists.

   or

   Place the directory where your old make engine resides first in your
   path.