Win10 preview version automatically upgrades and restarts to stop at the boot screen. What should I do?

A netizen said that his Lenovo sl400 notebook was installed with the Win10 preview version not long ago. After the automatic upgrade, the system automatically shuts down. When the screen is turned on, the following screen appears, and it is stuck here. What can I do?

He said that his laptop is currently parked here after booting, and he does not recognize the USB flash drive. In addition, he said that he has deleted a folder with old in the C drive.
Workaround
This problem is caused by the hard drive not recognizing. It is recommended to unplug the hard disk and enter the BIOS to restore the BIOS settings (refer to "Detailed Steps for Win8 System to Enter BIOS Settings"), then reinstall the hard disk, and then re-partition and reinstall the system. Or it is recommended that you send your computer to the service station to unplug the hard drive for recovery.
When you encounter such problems, you can write down the key information and then find a solution on the Internet to solve it.