DOSBox for old school DOS emulation
While everyone knows that DOS programs can be run in any version of Windows in the command prompt, if you've ever tried to play a classic DOS game on your modern system you may have been disappointed.
If you're really intent on getting that classic version of Out of this World (Another World for our European friends) from 1991 working on your Windows XP box (or Mac OS X, Linux or even BeOS machine), check out DOSBox.
DOSBox can emulate 286 & 386
processors in realmode and protected mode, handles extended memory managers like XMS and EMS, emulates a myriad of
graphics subsystems including Tandy/Hercules/CGA/EGA/VGA/VESA graphics, and of course the obligatory SoundBlaster