I suspect the problem may be with XP(SP2), more than SHS4.
SP3 really put the shine on XP, and made it the OS that many of us gave up kicking and screaming.
Many drivers rely on elements of SP3 to run properly, and my guess is that this is the root of your problem.
Unfortunately, Microsoft has finally put the kabosh on XP, and I doubt that you can even update to SP3 at this point in time.
While I share Meshes recommendation for X3, IT WILL NOT INSTALL in XP.
An overall system upgrade would be well worth it.
I started out with SHS4, and it was a great program in its day, but a lot of really cool stuff has happened since then.