dos based software

I have a very important software, which used to work on DOS 6.2 – subsequently when I changed it to the win 95 environment, it still continued to work beautifully. When I obtained a new PC with the win 98 environment – this dos program does not respond – even though I run the program on pure dos mode without the involvement of windows. what should I do to get it running?
Can I load a dos 6.2 on to C:\ and then install this program on c:\dos\myprogram\…. ?