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Apparently, the number you have told me as the model number is only the chassis number. Here is a link to a Sony site that will tell you how to find the actual model number (leave it to them to be difficult!), and then you may have better luck finding the driver.
You have to stay within the confines of the numbers! The only changes that you can use are the A and B, When you start to vary the model numbers, the features change as can the location of parts like jacks and ports on the outside and plugs and pins on the inside. SONY is not part friendly and not cheap to replace.
On every computer motherboard there is what's called a UART chip. This chip is responsible for capturing every keyboard click, interpreting what letter it is, converting it to zeros or ones used by computers, and sending it to the processor for action. If this chip fails, even replacing the keyboard won't fix it.
Unfortunately this chip is usually part of the motherboard so the only way to replace it is to replace the motherboard, which usually isn't cheap. If you can live with the external keyboard you might want to stay with that. Otherwise, if you Google sony Vaio motherboards, I'm sure you can find a number of sources online to purchase a motherboard. Replacing one is tricky but not insurmountable if you take your time and can follow directions, also available online.
Best of luck! Hope this helps!