Well, there's your problem.
NEVER edit .exes in notepad.
1) They're usually encrypted, so if you do anything this happens
2) This happens
If the problem is 1, just re-install from a different source.
If it isn't, then the program is looking for stuff that isn't there. So stop making it look (take out he stuff you put in) or put the stuff in (find the missing textures and put them where they're supposed to be)
Either way, a full re-install from a different source would be the best option.