my keyboard s not working(only few keys were working randomly), I got a new keyboard(hp) but it is totally not working, I checked drivers, I uninstalled and restarted but no use, led s glowing , I also changed the usb port, no use, *** help out

That's very strange indeed, have you been able to try the keyboard on another PC, maybe a friend, just to see if you have a faulty one, also have a look here:

Troubleshoot wired keyboards that don't respond or that type wrong characters (http://support.microsoft.com/kb/258826)