May help to post make of laptop,
This fix was created for laptops in windows xp when using a PS/2 wheel mouse for a problem.You may be using a usb mouse but the method should disable Touchpad which is what you require?
Create restore point if you decide to use incase
reversing is forgoten(you could copy/print for to reverse off).
How to Create a Hardware Profile
NOTE: The modem should be active in each hardware profile for dial-in or dial-out connectivity.
1/ Click Start, point to Settings, click Control Panel, and then double-click System.
2/Click Hardware, and then click Hardware Profiles. Note that under Available Hardware Profiles, either the Docked Profile or the Undocked Profile (Current) profile is selected.
3/ Click Copy, type a profile name such as Out of Office, and then click OK.
4/Click the Out of Office profile, click Properties, click to select the This is a portable computer check box, and then click to select the best description for the profile. In this case, click The computer is undocked.
5/If you want to be able to choose this profile when the computer starts, click to select the Always include this profile as an option when Windows starts check box.
NOTE: This is how you can configure your computer to enable you to choose either the "Docked Profile", "Undocked Profile" or the "Out of Office" profiles when you start your computer.
6/Click OK, click the Docked Profile or the Undocked Profile (Current) profile, and then click Rename. Type a name such as In Office, and then click OK. The available list shows the "In Office" and the "Out of Office" profiles. Click OK, and then restart your computer.