windows 7 booting & reinstalling problem, bootmanager related

[abcdefghijkl944]

recently, i have been using my windows 7 for months but yesterday only,it crashed and when i am restarting the pc, its now even showing the repairing options upon inserting the windows 7 installation disc. i have my computer practicals in this week, and my pc has crashed and its not booting up.
and when i insert the windows 7 disc, it shows this following error(i am uploading the image of the error).please look into my matter carefully because i am in a big trouble.i am on verge of losing all my personal data because this pc is not allowing me to install fresh windows 7 at least.

here is the link to the image :

View image: IMG 20130903 140620

 

[gregrocker]

Well if you install over the current install then you will lose all of your data! You must rescue it first if all attempts to repair it fail, before reinstalling.

Everything you need is here to try to Fix Unbootable Win7