🚀 go-pugleaf

A friend just bought DR DOS 5.0 and is having some problems with it.  
His favorite DOS shell, Wonder +, won't work at all.  
when the program is run, it loads up, the copywrite is displayed, then it
starts printing "command or filename not recognized" over and over and must
be rebooted to get out of it.  Each time it prints the line, the drive light
flashes.  
I've tried it when DR DOS has been loaded hi, and when also when its loaded
low, no difference at all.

Any suggestions?

Thanks...