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Please:

• Give us your exact Blender, OS and GPU (including drivers) versions, as requested in the template!
• Ensure both your OS and drivers are fully up-to-date (and use official GPU drivers, not those provided by windows or tablet/laptop maker).
• Try to disable any running antivirus.
• Ensure you have no python executable available in your %path% envvar.
• Try to re-download and re-install Blender.
• Try the latest build from our buildbot.
• Try to start Blender in factory settings (--factory-startup commandline option) (this will ensure whether this is a userpref or addon issue or not).
• Try to tweak your GPU driver settings (e.g. try different values between 'performance' and 'quality' if you have such slider, etc.).
• Launch Blender from the command line with -d option and attach as text file here any error printed out in the console (do not paste it directly in comment).