Uninstalling spore will result in you totally losing your game, you cannot save your current play position only your creations. Various other users here have stated that if you save a certain folder in the Spore directory then you can save your game position but so far no one seems to have had any success with that including myself.
Regarding the installation code, as windows rarely does a proper full uninstall and if you dont do a registry clean/defrag before reinstalling spore you may be lucky and the pc will retain the original install folder and retain the installation code.
Regarding the previous patch with the extra limbs, when u reinstall spore your be prompted to reinstall the various patchs, just ensure that you say no to patch 4 and the extra limbs from the other patchs will be there.
Hope this helps :-)
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