I have an Averatec 3200 laptop with Win XP Home SP2. Had no problems with the touchpad until I used a USB Logitech trackball mouse. Touchpad stopped working. All reference to the touchpad is gone (Device Manager, etc.).
I downloaded and installed the latest rev. of the Synaptics drivers from Averatec manufacturer website. Installed (with no mouse connected as recommended), still nothing. Touchpad does not respond, no Synaptics icon in system tray, no reference to the touchpad at all in Device Manager.
BIOS touchpad support is set to Enabled.
I understand that this may be a hardware issue, but it would be a remarkable coincidence that hardware failure happened precisely upon using the USB mouse.