Do you get any error messages? Did you actually uninstall the game or just delete it? If you didn't go through uninstall, there may be bits of it left over. I would run CCleaner on your registry and try something the Revo Uninstaller in case it didn't uninstall comepletely.
Revo Uninstaller You might also check in your Task Manager Processes to be sure there isn't another instance of the game still running in the background.