Once you have the .diagcab file (even if it came in a .zip or .rar archive): Microsoft Program Install and Uninstall Troubleshooter
The tool you're looking for is officially called the . While users sometimes search for "meta rar" versions, the genuine file from Microsoft is typically a .diagcab file. Download Microsoft Program Install and Uninstall meta rar
If the built-in Windows tools don't work, you can still find the original utility on official support pages and verified archives: Once you have the