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Did you check the settings for the left and right buttons under the mouse properties. Normally the left should be set on Click and the right should be set on Shortcut. If it's set to NONE then it will be inoperable. Better yet you can click the Default tab for buttons. Otherwise, it sounds like your touch pad needs to be replaced. The immediate remedy to this is to just go purchase a USB mouse and voila, you'll have the ability to left and right click.
If your computer have a, Synaptics Touchpad you can try these steps:
1. Access the properties of the Synaptics Pointing Device by right-clicking on the system tray icon at the bottom right-hand corner of the screen. If you do not see the icon, open your Control Panel and select the "Performance and Maintenance" option. Click "System", then "Hardware", then "Device Manager" to view the devices on your computer. Open the "Mice and Other Pointing Devices" selection.
2. Click on the "Device Settings" tab of the "Mouse Properties" window. The "Device Settings" tab is at the top of the window and located farthest to the right
3. Highlight the Synaptics Touchpad from the list of available pointing devices. Click the "Disable" button underneath the list. Click "OK" on the pop-up menu to confirm your selection. Click "OK" on the Mouse Properties window to close the window. Your Synaptics Touchpad will now be disabled.
Make sure to connect a USB mouse to your laptop before disabling the touchpad so that you will still have control of your pointer.
Uninstall the Touch-pad completely. Go to, and (Type): Toshiba Resources from the Start Menu. Type in Search by Product ("Synaptics Touchpad V7.2 on PS/2 Port"). Download, and restart the Computer, you may need to reconfigure functions (IE. "Sensitivity"). If by chance this fail? go back to Devce Manager and "Update Drivers (manually) using the ("Let me "update Driver").
hmm quite interesting has your laptop suffered some damage i recomend you try to disassemble your laptop and check the connector for the touchpad. dont know how try this site:http://repair4laptop.org/disassembly_acer.html
Go to the 'start' button and then hit the 'control panel' option, then click 'mouse' then go to 'Device Settings' and then to the 'settings'. When you get to this screen it shows a list on lthe left hand side choose the 'tapping' option and then ok.