I am helping a friend who has an HP Pavilion dv9700t laptop, with Windows 7 Pro x64 installed. The laptop has been running fine until recently, when the Synaptic touchpad's scrolling ability stopped working. The touchpad has not been exposed to excessive heat or subjected to liquid damage, and no changes have been made to the Synaptic Preferences or the Mouse options in Control Panel. A different driver hasn't been installed over the existing one. He asked me to help him determine why it has stopped working, but I can't figure it out. The only thing I can think of that may have caused both the horizontal and the vertical scrolling to stop working could possibly be a Windows update, but trying to determine which one is the culprit (if any) is almost impossible. I've tried disabling and re-enabling the scrolling options, and I've deleted and reinstalled the driver, but no luck. Should I roll back to a previous version, or try something else?
The driver version is 126.96.36.199 and the Synaptics Touchpad version is V6.3, if that helps at all.