Model: PCVA-KB7p/u internet keyboard
Operating System: Windows 98 (Note: might work with other versions of this os.)
This is the hot keys driver for that keyboard.
File size: 3175 KB.
File name: SONYHotKey.rar
Unzip to a temp folder. You will then have 3 folders. Each folder contains a setup.exe to launch the install program. You may have to try them all to find one that works. The version.txt file in each folder contains the driver version. Sorry, but I had no details to work with.