Windows 10 taskbar and start menu not loading

I've upgraded to Windows 10 on my Lenovo Yoga 2. Last night, it made a loud whirring noise and turned off. When I turned it back on, it wouldn't let me click on the taskbar or start menu, it would just give me the loading cursor. The taskbar icons also do not load.

Sorry if this is the wrong forum for this type of issue.

Using startup repair or booting in safe mode did not solve anything and system restore failed

I had a similar issue however I had an alert stating that Cortana and my taskbar had failed. I came across another site that stated to try uninstalling my Anti Virus software specifically Avast. Apparently Avast and windows 10 clash. Not sure if this is your problem but maybe it will help.

Do those dealing with this problem have avast antivirus installed? If so, I believe that is what is causing the 'critical error'. I uninstalled the software and upon reboot my start button and cortana were working perfectly again. Now I'm sure you all know how to uninstall software on your PCs but it may not work in normal mode with the critical error as it didn't with me. Therefore I uninstalled in safe mode. Incase you arent familiar with how to access safe mode on windows 10, heres how: You press ctrl+alt+delete, and in the bottom right hand corner you click the power button. Before you click 'restart', hold down the shift key until the next screen is displayed (blue). Then click troubleshoot, advanced options, start-up settings, restart. Once it restarts, press the F4 key, and when it restarts you will be in safe mode. Now just do the normal thing to uninstall avast and then reboot following the installation and it should be fixed!

Source: http://forums.windowscentral.com/windows-10/372745-windows-10-start-menu-cortana-not-working-fix-here-hopefully.html