I had exactly the same problem with my Sony CS190. The driver that is missing is the Synaptics Touchpad driver. For some reason Sony have not included it with the Windows 7 drivers, presumably because Windows 7 drives the touchpad. You will find the driver you need under Touchpad in the Vista Home Premium OS. I included the link below for you. Hope this helps.I have a Vaio CS190 and the AV mode touchpad does'nt work after i installed windows 7 and i can control the volume or access music from it, HELP PLEASE!
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