Delete it by putting the bg2 folder in trash can .. I have many prog un instal with The add/remove fonction and it is not delete in the program list after too. If you delete it by putting the folder in the trash can, they wont ask you to override since you DO not have it now ... I you want to keep the save game just dont delete that part only, you do know where it is stored I think.
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Maybe it's because I hate drows more than I hate Humans - Jarlaxle to Entreri