This is truly dumb question. Windows 10 Pro Installed R (R x64 3.5.2). Installed RStudio (RStudio-1.1.463) I can start R. I have no desktop icon for RStudio. How do I start RStudio? I am embarrassed to even ask. 
R version 3.5.2 (2018-12-20) -- "Eggshell Igloo"
Copyright (C) 2018 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)
On Windows 10, down in the lower left corner, you can open up your start menu and scroll until you find RStudio.
WORKS! FIX: In Windows, go to >> Computer Management >> Services & Applications >> Services, disable 'Wacom ISD Service' [set 'startup type' to 'manual'].
Changed to Manual 3/6/2019 RStudio now starts!
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