Instructions on how to disable your touchpad
All ThinkPad Systems
Solution 1: Short cut Key (for selected ThinkPad models)
A pop up will appear UltraNav device settings
Chose the second option which says Enable track point only (disable touch pad)(Fig 1.1)
Solution 2: Manual settings
Click on Windows Start Button
Go to Control Panel
A pop up screen of Mouse Properties
Choose UltraNav (Fig 2.1) tab or ThinkPad (Fig 2.2) Tab
Uncheck Enable TouchPad
Solution 3: Disable Touchpad via BIOS
Shut down your ThinkPad then power it on.
When the ThinkPad logo comes up, immediately press F1 to enter the BIOS Setup Utility. If your system has a Supervisor password set then you'll need to type it in when requested.
Now use the cursor keys to navigate the menus until you find the one that relates to the TouchPad.
Toggle the setting from Enabled to Disabled.
Then press ESC until you get back to the Main Menu.
Save the updated BIOS settings and then Reboot to Windows.
Note: If you are unsure of what Fn key to press when the ThinkPad is booting, try pressing Enter button and select the bios from there.