Escape key is not working.....

Hi SF,my escape key is not working while playing COD MW3.I'm playing game since a week.After closing game,still its not functioning.Closed game through alt+tab keys.
Troubleshooting not helped.
Also windows task manager is not opening from desktop,as escape key is not working(ctrl+shift+esc).
And other function keys f3(projector),f5(wireless) and f6(pointing device) are not working.Other keys are working well.
I had also tried removing and placing keyboard plug inside laptop but it dosent help.

Does control alt delete do anything ?

AddRAM said:

Does control alt delete do anything ?

update:alt key also not working since closing the game....
Left alt,escape and keys mentioned above are not working.
I can open task manager through ctrl+right alt+del....
Can i know cause of problem??