It seems something is wrong in Windows. Things you can try:
1. Boot from the recovery drive you made after the last big Windows update. https://support.microsoft.com/en-us/help/4026852/windows-create-a-recovery-drive tells how to make that (recommended for the future, if you didn't do it yet).
2. Go back to factory conditions the Lenovo prescribed way. Might be a special boot option. We don't know, you do.
3. Download Windows 10 from https://www.microsoft.com/software-download/windows10, boot from the disc or stick you make and see if the recovery options work or simply run the setup to install it over your current installation.
My lenovo yoga 510 is not responding upon startup. I can move around the pointer and the animations and everything work fine except for the Taskbar. But even outside the Taskbar, I'm not able to open anything except for task manager.
When I hover over the Taskbar, the pointer becomes that loading icon and I can't do anything. In the past, I used to repeatedly click on the Taskbar or restart windows explorer through the Taskbar until it worked. But now even that isn't working and I'm not able to do anything.
I would provide a picture, but I don't know how to do that on this forum. Please help me as I am extremely frustrated right now and there's some work I need to be doing on it.