Win7 system can not enter F8 and no mode how to do

1, the specific problem is the following picture of the boot:

2, this problem occurs, if you do not have important things in the computer, personal advice or reinstall the system, the following how to not reload it! Br> If you have a USB flash drive, or have a system disk
3, if it is a USB flash drive, it must be set on the bios motherboard, set to boot from the USB flash drive.
Command prompt tool under WinPE system; then enter the following DOS command at the position where the cursor is located (press the Enter key for each DOS command):
4, the order is:
Cd c:windowssystem32
bcdedit /set {default} osdevice boot
bcdedit /set {default} device boot
bcdedit /set {default} detecthal 1
The effect is as follows: