You receive an "Unable to uninstall: assembly is required by one or more applications" Windows Installer error message when try to remove an assembly from the Global Assembly Cache (GAC) by using the Gacutil.exe tool
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When you try to remove an assembly from the Global Assembly Cache (GAC) by using the Gactutil /u command at a command prompt, you may receive the following Microsoft Windows Installer error message:
Unable to uninstall: assembly is required by one or more applications.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To work around this problem, examine the list of values for the following subkeys in Registry Editor:
=ysgSC6wx9uiD1dqmmjW>m$!GP^D'A@?z}gn3}ltaNote You must delete the <Assembly Full Name> entry. Do not just clear the value of the <Assembly Full Name> entry.
Windows Installer is a probable source of the erroneous registry entry that blocks the Global Assembly Cache tool (Gacutil.exe) from uninstalling the assemblies. Gacutil.exe itself does not read from or write to the registry, but it starts the utilities that search for the Windows Installer references in the registry.
Gacutil.exe cannot override Windows Installer reference counts.Several possible causes of conflict exist between Windows Installer and Gacutil.exe. If you use Windows Installer to install an assembly in the GAC, Gacutil.exe may not be able to remove the assembly.
For more information, visit the following Microsoft Developer Network (MSDN) Web site:
Article ID: 873195 - Last Review: 12/08/2015 07:57:05 - Revision: 2.0
Microsoft .NET Framework 1.1, Microsoft .NET Framework 1.0
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