as RDP said, you are posting in the wrong forum so i will move it to the sh3 forum
that said the poblem you describe is usually due to not uninstalling properly and removing all leftover files.
you have to unistall all your mods before you uninstall the game or all your modded files will be left behind and corrupt the game again.
look over this sh4 thread which is the same steps to take for sh3 as well for more info on proper uninstalling/reinstalling process:
http://www.subsim.com/radioroom/showthread.php?t=133290