PLease SOmeone help. My windows 7 Crashes n it WOnt Start the window.!

Hello.
from yesterday i m facing this BSOD Problem.
this is however not happened to me before but from yesterday i could not log back into my laptop, it started when window (7) was trying to do a update on service pack 1(windows7) , by mistake my cousin bro he turns the laptop off , as a result service pack was not updated, after that when i tried to turn the system back on it wont just let me log in , i get this message at the start up, checking windows configures as well as this message failure service pack (something like that). i tried starting up my window using safe mode and also did those recovery tools method to fix things but it just wont get fixed, i don't even have any earlier system restore point, so i cant even restore the system to the earlier point.

What will be the best suggestion for me to do right now ?
i cant afford to buy new windows 7 again.
My system is sony vaio 4gigs ramm intel core i3 500 gb hard disk

Help!!!

To enable us to assist you with your computer's BSOD symptoms, upload the contents of your "\Windows\Minidump" folder.

The procedure:

* Copy the contents of \Windows\Minidump to another (temporary) location somewhere on your machine.
* Zip up the copy.
* Attach the ZIP archive to your post using the "paperclip" (file attachments) button.



To ensure minidumps are enabled:

Go to Start, in the Search Box type: sysdm.cpl, press Enter.
Under the Advanced tab, click on the Startup and Recovery Settings... button.
Ensure that Automatically restart is unchecked.
Under the Write Debugging Information header select Small memory dump (256 kB) in the dropdown box (the 256kb varies).
Ensure that the Small Dump Directory is listed as %systemroot%\Minidump.
OK your way out.
Reboot if changes have been made.