Some machines are having a wee spot o' trouble with the new April Update from Microsoft, rendering their machines fairly unusable.  It seems that after the update your desktop is replaced by an error message, "C:WINDOWSsystem32configsystemprofileDesktop is unavailable" and you are no longer able to use Windows Explorer.  There are numerous ways to recreate the desktop file under your systemprofile directory, however many of these could lead to losing files on your desktop, which is why you are better off following the instructions in this Reddit post.  

So far there have been numerous theories about what is causing this issue but many have proven inaccurate and the remainder are not overly compelling.  Long story short, if you have been holding off on installing this update, you should continue to do so; likely a decision you have already made a while ago.

"The problem, which first appeared in a posting on a Microsoft support forum on 14 May, has gained a bit of traction over the last two days with users taking to social media as they go through the three stages of installing this update: frustration, fury and despair."

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