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Windows Installer - Simple Fix that worked for me.
All the complicated fixes I've tried even those from Microsoft did not work. This one below work perfectly tor epair Windows Installer issues:
HERE IS THE FIX THAT WORKED FOR ME : Start, then Run, then type regedit Go to HKEY_LOCAL_MACHINE\SYSTEM\CURRENT CONTROL SET\SERVICES\MSIserver\WOW64 Right click on WOW64, then select Modify Set Value Data to 0 (mine was set at 1) and Base should be Hexadecimal Close everything, reboot, and see if you can uninstall or reinstall.