Reply DOS on Mac card issues

I have been easily running the PCSetup Free version 2.1.f, until recently with a new system folder, I lost the PC Clipboard function and could not cut and paste between MAC and DOS.

So, stupidly I suspect, I reinstalled PCSetup 2.1.f on the Mac side, the PC side seemed fine.

Now when I go to switch over, the screen goes 1/2 dim and then beeps, I can still see the MAC side but I am not at either OS. Switching again brings me back to the MAC side.

So I have lost the ability to go to the PC side for now. Do I need to reinstall the MAC side up from the original 1.6.4r as I did originally or is there a easier way to undo what I did?

Thanks,

joseph