DOS 2.62 ? <img src="/ubbthreads/images/graemlins/eek.gif" alt="" /> Sure ? Not MS-DOS 6.22 ?
You could try FreeDOS, or the Demo version of Paragon's PTS DOS ...
http://en.wikipedia.org/wiki/PTS-DOSThe Demo version - if you can find it - needs 2 Minutes for startup, is otherwise unrestricted.
Another possibility is OpenDOS, if you can find it. It was a free DOS, and if you happen to dind the old files on the net, it should be possible to use it as well. It's kind of an version of DR-DOS.
http://en.wikipedia.org/wiki/OpenDOS