(re: SQ4 memory problem)
First of all, are you trying to install the Windows version (setup.exe) or the DOS version (install.exe)?
When you say you’re trying to play in DOS, do you mean you quit to a DOS prompt? Or did you open a DOS prompt within Windows?
If you have installed the Windows version, what happens when you try to run it? (In other words, when you say “it doesn’t work at all,” what have you tried to do and what happened when you did it?)