ɪt lˈʊks ˌʌp ɹˈɛdʒɪstɹi ɹˈɛfɹənsᵻz ænd fˈaɪlz ɹᵻlˈeɪɾᵻd tə wˈɪndoʊz ɪnstˈɔːlɚ ðæt wɜːɹ ɪnstˈɔːld baɪ vˈɛɹiəs pɹˈoʊɡɹæmz, ænd fˈoːɹsᵻbli wˈaɪps ɪnvˈælɪd ˈɛntɹiz ˈaʊt.
It looks up registry references and files related to Windows Installer that were installed by various programs, and forcibly wipes invalid entries out.