JUST HAD THE SAME PROBLEM WHEN TRYING TO REINSTALL THE GREAT CLASSIC OF YESTERYEAR!
THE PROBLEM IS THAT A TROJAN HORSE VIRUS HAS MOVED THE FILE AUTOEXEC.NT SOMEWHERE ELSE SO YOU NEED TO SEARCH FOR THE FILE AND COPY PASTE IT TO THE SYSTEM32 FOLDER. YOU CAN THEN INSTALL AND WASTE AWAY HOURS AND HOURS OF YOUR DAYS MAKING SURE ALL THE WATER PIPES LINE UP!!
HAPPY PLAYING