Based on this KB article you have to go look in these keys
• HKEY_CURRENT_USER\Software\Microsoft\Installer\Assemblies\Global
• HKEY_LOCAL_MACHINE\Software\Classes\Installer\Assemblies\Global
You have to look in those keys for REG_MULTI_SZ entry that resembles the following:
=ysgSC6wx9uiD1dqmmjW>m$!GP^D'A@?z}gn3}lta
and if you find one, remove the complete entry
for your convienance you can run thse two commands to find if you have keys that fullfill that criteria:
reg query HKEY_CURRENT_USER\Software\Microsoft\Installer\Assemblies\Global /v /f "YourAssembly*"
reg query HKEY_LOCAL_MACHINE\Software\Classes\Installer\Assemblies\Global /v /f "YourAssembly*"
Output you will see for example for assembly EntityFramework*:
EntityFramework,version="4.1.0.0",culture="neutral",publicKeyToken="B77A5C56 1934E089",processorArchitecture="MSIL" REG_MULTI_SZ
nRfmTp.Na@?e!bFXjH]yMa in>'J*rOm2_)=0&Rea1c^?{