I would make certain that the .NET 4.5.2 patch is downloaded and installed.
Make certain to close all browsers, as well as any other programs, and use the Windows Control Panel, Windows Update function to install the patch. This will take a little while: the download is quick, but the installation takes a few minutes.
Once the patch completes, you will also be required to reboot, and there, as with many other Microsoft patches and service packs, will be two additional parts to the installation: - one when you shut down, and; - another when you start up again - both automatic, so, if you are updating on a laptop, make certain your battery is charged all the way up or you are connected to a power supply or mains.
If you continue to have issues, please post them here. A screenshot may be helpful to assist you in troubleshooting further, and can be pasted into a REPLY, but not into a comment.
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