Vista Application Data Folder
 

OOTP installs data to the Program Files, My Documents, and Application Data folders. The information in the hidden Application Data folder is not removed by the uninstaller and should be deleted when attempting to uninstall and reinstall the game in the event of unusual behavior.

In Vista, the applicable folder can be found at:

C:\users\(your username)\appdata\roaming\Out of the Park Developments\OOTP Baseball 9