Windows 10 will not shutdown and desktop icons disappear when clicking refresh

I am having some issues with my Windows 10 installation. Currently I cannot shut down my computer without physically pressing and holding the power button on the front of my computer. If I click the start window button on the bottom left then click 'power' -> 'Shut down' nothing happens at all. The start pop-up disappears and my PC will not shut down. The same happens for 'restart'. Sleep seems to work fine.

Additionally, and not sure if this is a separate issue, when I right-click on the desktop and click refresh, all my icons disappear and do not retu for about a full minute. This is conceing as I have a very powerful 4GHz 4790k Intel water cooled system with 32 gigs of memory and a 1TB PCI-E nvme hard drive which is normally ridiculously responsive, so I'm not sure whats going on here. Any advice?

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