Tropico: had it installed, did reinstall and it crashes :(

[dx]

I dunno what the hell happened. I installed the game. played for like a week. uninstalled (regret it now). was gonna burn the cd, so then i tried to reinstall, but a file was corrupt on the cd. So what basically happened was the game got in my registery, but i can't run setup, it crashes sez it can't write a common file for installshield. anyone have any clues? i don't wanna format

ps: runnning win2000pro