The Sims won’t uninstall, does anyone know what might be wrong?

I uploaded the Sims Deluxe Edition onto my Vista Laptop a while ago, and it didn't run properly. I didn't really mind, I just tried to uninstall it and forget about it only it wouldn't uninstall and now I'm running out of space. It doesn't show up as having any files or anything, but in the Add/Remove Programs box, it shows up. When I click Uninstall/Change, all it does is try to reinstall it and asks for the first disk. I really need the space- does anyone have any tips?

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