Wow, you are a kind one (or just increment your posts counter?

).
Anyway, take my small advice: try to break XProtector first. If you will be not able to do it then
do not touch Starforce. You will lose your time. If you will be able to break XProtector then you should be able to deal with Starforce.
Forget about anti-debug stuff, that's
not the point.
Have you even wonder why XProtector or Starforce were cracked by 1-2 persons only? Look at all the information on the web. The funny thing is that people are fighing their (XP & SF)... anti-debug features. That is a serious mistake and it seems that it was the intention of authors (fool crackers by cracking their mind). Anti-debug features are for fun. It does
not bring any serious shield because it has no logic inside. Do you want to defeat SF? Then first you have to write own logger, decompiler and the last one........ but hey.... you will know what after dealing with first two.
Good luck.