350mhz is probably choking on xp.
v.37 might work. I don't know if it plays Star Wars, but you could probably find a 10x better computer for free with little effort.
There used to be a DOSMame installation disk floating around somewhere, but you pretty much need a sound blaster card for the sound drivers to work.
Throw the thing away already.
About the time you get something working on it, the power supply or hard drive will die and you'll be stuck spending money on parts to keep it going.