Did you uninstall the old version before installing the new one?
If not, did you try to install the new version into the old folder?
Maybe you still have the Quicklaunch icon from the old version and used that to start game?
If i were you, id uninstall BOTH versions (in your System Manager/Software) and the delete the both installment folders (uninstall shield leaves the settings intact). If you have settings/sounds or other custom stuff you want to backup, do so first.
Now reinstall the new version fresh.
Hope this helps.