You might try installing the most recent driver for your touchpad to see if it resolves the disabling issue. If you have a Sentelic touchpad, that driver version is 9.1.7.7, available in JRd1st's Drivers, Apps, and How-To Sticky. A link to the most recent Synaptics driver is also available there.
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT