The fact that the keyboard works for bios settings, suggests it ought to work normally.
Things to try:
* Look in Device Manager (located under a tab in the System control panel). See if there is an alert icon, next to the keyboard, signifying a problem.
* Try starting in 'safe mode'. (Done by pressing F8 multiple times during startup, wait for a list of options to appear, and choose Safe Mode.) See if the keyboard works. If it does, then the problem is in ordinary Windows mode. Maybe an updated driver is needed.