How can I install windows from a windows image?
If I convert windows cd to an image and suppose my windows is destroyed then how can I insatall windows from an image?
There are two cases
Sometimes window is there but is corrupt
Window just disappears, and blank screen is there

Are you saying you made a copy of the Windows Disk? Where did you copy it to?

You can create an image of your drive using software like Ghost or True Image. You create a bootable disk that will restore the image. But this will overwrite the entire partion including and data files stored on it.

Personally use Acronis True Image and successfully restored operating systems a few times.