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The keyboard is typing characters instead of letters. Num lock is off, keyboard isn't showing up in devices
try downloading the Notebook control and utilities or the Hotkeys on the esupport.sony.com website.
Follow the steps mentioned in the link provided by “Coolhunt” to troubleshoot the Keyboard issue.
To reset the BIOS follow the steps mentioned here: http://www.kb.sony.com/selfservice/documentLink.do?externalId=C1025393
To restore your computer to an earlier time when it was working fine: http://www.kb.sony.com/selfservice/documentLink.do?externalId=C1003813
If the issue persists, contact Sony Service Assistance Team here: http://esupport.sony.com/US/p/service.pl
Note: If my post answers your question, please mark it as an "Accepted Solution."