What if your system begin to malfunction at the middle of the road while you were playing with computer.. and what if you are not able to load windows.. then only alternative is to use system restore.. but.. how will you load system restore without loading windows..
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%\system32\restore\rstrui.exe and hit Enter.

That loads the System Restore window. Continue as usual restoration.