Reinstall or Repair .NET Framework

Recently, my desktop always need to check .NET Framework after logon computer. I don’t understand what happen so that decide to repair it. When I do it, the result always fail.

How to resolve this problem?
To view Installation log and enable “Errors” check box
Drag down the scrollbar to bottom, you will see some message mark red block
Based on “0x80070663” error codes to search it by Google, I find out one KB can help me.
Because it have a utility “dotnetfx_cleanup_tool.zip” can be downloaded.
I download/extract this tool next to execute it, click “Yes” to run the .NET Framework Setup Cleanup Utility.
Click “Yes” button to accept all of the terms of the preceding License Agreement if you want to execute this utility.
In “Product to cleanup” field to select you want to be removed. In the moment, I select “.NET Framework – All Versions (Windows 7)” next to click “Cleanup Now” button.
Processing now!
Click “Finish” button to end up the Installation if it is successful.

If you try to reinstall or repair .NET Framework, it will be done and no any error show up now.