Last night my laptop shuts down because of low battery and after plugg

Last night my laptop shuts down because of low battery and after plugging the AC Supply when i restarted the Windows 7,it din't worked.
It asked me for the two options - Startup repair and Launch Normally.I chose Launch Normally but after 3 seconds of the boot screen,there came a blue screen which just flashed for half second and laptop got restarted.

This is happening again and again.Someone please tell me a way to get out of it.I don't want to loose windows as it has very very important data for me

Hi there ...
You can either choose the repair choice which the 7 Windows offer .. Or Try installing another copy of 7 , and there in the installation window choose to repair the existing system ...

Tell me about what you get ...

Try restarting your computer and upon booting Windows, tap the F8 key until you see this screen. Choose the option in the screenshot and report the error that the BSOD is showing.

It says that "A problem has been detected.....................................Select Safe Mode.
And after it there is a file name 'WDFLR.SYS' written and some Hexadeximal code like 0x0000007E etc.

Here is what I recommend: Find someone who has Windows 7 64-bit Home Premium installed. Copy their WDFLDR.SYS file to a flash drive. It will be located in C:\Windows\System32\Drivers.

On your system, plug in the flash drive. Use Advanced Boot Options to choose Repair Your Computer and then use Copy & Paste - in Windows Recovery Console to replace the wdfldr.sys file in your own Windows\System32\Drivers directory.

NOTE: Your Windows directory may not be on C: and may be on D:, E:, F:, or even G: depending on your partition layout. It will not be on X: because X: is the memory virtual drive created for the recovery environment.

You mean to say that I should find a system having the same OS installed as of mine.
But Wdfldr.sys file is already there in my Drivers Folder ( I can view the structure of my failed OS via my another Windows 8 installed on another drive)

technoankur said:

You mean to say that I should find a system having the same OS installed as of mine.
But Wdfldr.sys file is already there in my Drivers Folder ( I can view the structure of my failed OS via my another Windows 8 installed on another drive)

If you can view the folder from Windows 8, delete Wdfldr.sys from the drivers folder and then replace it with someone else's copy.

Well i tried doing the same,but it din't worked

technoankur said:

You mean to say that I should find a system having the same OS installed as of mine.
But Wdfldr.sys file is already there in my Drivers Folder ( I can view the structure of my failed OS via my another Windows 8 installed on another drive)

The file may be corrupted. Just because it is there does not mean it is intact. May I also recommend you proceed with the steps in SFC /SCANNOW : Run in Command Prompt at Boot to see if it can repair any other corrupted files.

technoankur said:

Well i tried doing the same,but it din't worked

Not sure I understand what you mean. You tried replacing the file? Or you just tried starting Windows again? Did you replace it with someone else's copy, or did you use your own? Please explain what steps you did in more detail.

I copied and replace my file with someone's else file (wdflr.sys) but it din't worked !