Using the Microsoft Repair Tool to Fix Installation Problems with XCOM for Window

Document ID : KB000074832
Last Modified Date : 26/03/2018
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Introduction:
I need to uninstall the current XCOM in order to install the latest version. However, I could not uninstall XCOM due to error " ......Failed to complete installation ". I am uninstalling XCOM from the Program and Features screen.
Instructions:
Here is the latest version of the Microsoft repair tool: 
Fix problems that block programs from being installed or removed 
for: Windows 10 Windows 7 Windows 8.1 
Please download it from the Microsoft website and use this first. 
https://support.microsoft.com/en-us/help/17588/fix-problems-that-block-programs-from-being-installed-or-removed