Currently Being ModeratedApr 11, 2013 4:44 PM (in response to MS0)
To help us furthur help you, please try these steps.
Reset PRAM by holding CMD, OPT, P, R at boot until you hear the Chime again.
Then login to an administrator account and try to create a new account.
If the issue does not present itself in the new account, that is great, if it does follow this step.
--> System Preferences ---> Keyboard ---> Keyboard Shotrcuts --> Click "Restore Defaults" then click back to "Keyboard" tab then hit "Input Sources". Please check ONLY the appropriate keyboard map. If your Mac was purchased in the US choose "US". Make sure it is just US and not US extended or such.