Cannot install updates.

My computer downloaded updates for my Laptop. Upon restarting to install the updates it reaches a point and can not install certain updates. All it shows is fatal error. Every time i switch off the laptop and restart it, it re-installs but on reaching that particular point, an error code is created. What should i do????

You could do a system restore to an earlier point.

http://www.sevenforums.com/tutorials/700-system-restore.html

Once up & running again then try to figure out what update caused the issue. Which is going to be hard.

It cant log in. Every time it restarts, it automatically starts updating itself and then reaches a point where it says Fatal error C0190003> So i am forced to shut it down.

Restart the computer > just after the BIOS splash screen (before Windows would normally start to load) begin repeatedly pressing the F8 key > a menu will appear > navigate down the list to "Restore Last Known Good Configuration" to highlight it and press ENTER.