Attempting to install Visual Studio 2012 Professional or Ultimate on top of an incomplete Express edition installation.

If the installation fails, open vs2012_update_log.txt and search for the term . This universal Windows Installer error code points directly to the failing script or dependency. Best Practices to Prevent Future Installer Corruption

: Modern versions of Visual Studio (2017+) use the InstallCleanup.exe tool located at %ProgramFiles(x86)%\Microsoft Visual Studio\Installer\InstallCleanup.exe to achieve similar results. Alternative Maintenance Tools

Sweeps away orphaned registry entries that trick new installers into thinking the software is already present.

If your issue is specifically with broken C++ functionality after updating .NET Framework 4.5, you may need a specific KB patch rather than the cleanup tool. Update for Microsoft Visual Studio 2012 (KB2781514)

I can provide the exact steps for your situation if I know the details.

: Look for specific updates or patches like KB2781514 on the Microsoft Download Center which address setup flaws.

Loss of power or network connectivity during a major Update service pack installation.

Alternatives and modern approaches

This command performs the same function as the "Clean Solution" menu command within the IDE and can be useful for fixing build errors caused by stale intermediate files.

Since Visual Studio 2012 is no longer under mainstream support, use the following methods to resolve installation or removal issues: Microsoft Learn Official InstallCleanup.exe Tool