1) In the system tray, click the pointing device/touchpad icon> click Pointing Device Properties.
2) Click the "Device Settings" tab.
3) Select your touchpad (it was the only option on my system.)
4) Click Settings.
5) Expand Pointing
6) Expand Sensitivity
7) Select PalmCheck
Adjust the sensitivity slider until you can move the mouse while pressing one of the walk keys.
9) Click OK twice and that's it
Here is one more solution (it's more or less the same)
1) Clic Start menu> Control Panel
2) In the search bar for the control panel, type "mouse"
3) The first result will be the word "mouse" in green, with a bunch of other topics underneith. Click on the top word "mouse" in green.
4) Clicking this will bring you to a popup menu titled "Mouse Properties"
5) Click on the tab in the top row of tabs called "Device Settings"
6) The window it brings you to, will have a white box with your touchpad name in it. Underneath this window, there will be a button for setting. Click it.
7) This will pop up with another window, that has a list of different settings to click, such as "Overview", "Pointing" and "Buttons". Hit the + button right beside the word "Pointing".
In the menu that opens, click the + button beside "Sensitivity"
9) From that menu, click "Palmcheck"
10) From this menu, in the "Palmcheck" window, drag the slider from the middle, all the way down to the minimum. Hit okay, and you're all set!
P.S. When you quit your game, put the slider back to minimum