QReport prints in Windows ME, but not in 95/98

I have a programme which generates a QuickReport in Delphi 5.  When I run
the programme on my Laptop (Windows ME) it prints perfectly on the clients
printers (via Network), but when I loaded it on to the clients computer, the
labels don't print (just gives a form feed), and the report WReport gives
the error message "Selected printer is not valid".

Any suggestions would be most helpful.