If you have enabled System Restore, you can use it when you fails to boot into Windows.
How to do:
Restart your computer.
Press F8
before the Windows Logo displays. (Keep pressing F8 from the starting itself)
Then the Windows Boot Menu displays.
Select Safemode With Command Prompt and hit Enter.
Windows loads to Command Prompt.
Then type the following:
%systemroot%system32restorerst
rui.exe and hit Enter.Then the Windows Boot Menu displays.
Select Safemode With Command Prompt and hit Enter.
Windows loads to Command Prompt.
Then type the following:
%systemroot%system32restorerst
That loads the System Restore window. Continue as usual restoration.