System Information
Operating system:
Graphics card:radeon 580

Blender Version
Broken:2.79b
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error

My inputs in preference are gone. I cannot extrude. All my addons have uninstalled. No matter how many times I redownload blender 2.79b our A its still the same.