The below steps work on all Dell, HP, Acer, Asus and Toshiba laptops as the problem is with the Synaptics touchpad software and is not a Windows related problem.
Go to Start > Control Panel > Mouse
Choose the Device Settings tab on the right.
Click the Settings… button
On the left there is a menu. Choose Pinch Zoom. Then UNCHECK the “Enable Pinch Zoom” box.
Click Apply at the bottom and OK to exit and save settings and your Done!