Hey Ivan
You're lucky that Starforce let you install at all
Mine took some "subtle" negotiating with Starforce Customer support to get working.
Starforce is the protection software, on my PC its installed as a hidden device driver so you may not see it but it is there. SHIII will install it again if you remove it and won't start without it (unless you're a
).
Disable it and see what happens, I suspect you'll get an error or Starforce auto-reinstalled.