Look for a copy of DFend Reloaded. (
http://dfendreloaded.sourceforge.net/ ) It has a copy of Dosbox built into it and I use to run all my old Sub Simulators under WinXP Pro...
688 Attack Sub
AOD (Not CAOD)
DasBoot
Fast Attack
GATO
Red Storm Rising
Seawolf SSN21
Silent Hunter Commander's Edition
Silent Service 2
Epyx's Sub Battle Simulator
SubHunt
UP Periscope!
WolfPack
These are all the Sub Simulators I'm currently running under DFend Reloaded!