My Sony Viao touchpad stopped working as well. I called the Sony support, they ran a simple test (booting in a different mode) and determined that the touch pad requires replacement. Oddly, about a few hours later, our Asus laptop touchpad stopped working. The Asus helpdesk suggested to reboot, but remove the battery for a minute before starting it up again. That fixed the problem on both laptops. Except, I noticed that my touchpad works fine at the office site while I am connected to the network via ehternet cable, but when I am at home using a wireless connection, the touchpad will eventually stop working again. Any clue why? Virus? Sony Viao is scheduled to come this week to replace the touchpad.