How old is this printer? If the printer itself was geared only for 9x-ME originally without driver support for NT/2000 it's time for a new one that is 2K/XP compatible. At this time all you can do is take a look at the manufacturer's support site to if NT/2K/XP drivers are available for that model. Another option is to locate a generic version for 2K.
Dos drivers themselves would be useless on a 2000 system. Dos is a Fat16 or Fat32 type partition while 2000 resides on an NTFS type and is incompatable. If it was a matter of trying to run an dos app you could have tried a program like DosBox. For drivers you need those designed for the OS you are running.