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CCleaner and Glary Utilities have uninstallers.

Glary Utilities tries to get you to install a toolbar.
CCleaner tries to get you to install something if you are using XP (I haven't noticed anything being offered to me in W7).

I've used both of these programs for years and the only problem I've encountered was related to MS Project.
Both of these programs offer to create backups (CCleaner) or automatically create them (Glary Utilities).