Ew! Someone's been downloading porn!
If there's no uninstall, you have a few options. First, try running a tool like Ad-aware (Lavasoft) to see if it can't detect it as a problem. Chances are it won't, but can't hurt.
Next, try finding the folder associated with the app and delete it.
Then, go into the registry and locate the appropriate key folder and delete that.
That might clear it up.