Is it possible to disable MacBook trackpad under Windows 7?
Well, good news. I figured out how to stop that annoying errant cursor from suddenly moving my typing to an unintended place.

Ignore all you have read above.

On the Start bar at the bottom on your screen, far right find the Boot Camp icon.
Click it
See "Boot Camp Control Panel..."
Click it
Click Yes to allowing to proceed
See at the top tabs "Trackpad"
Click it
unclick Tap To Click
click OK

Voila!

Now touching the track pad won't move the cursor...only pressing down to "click" it will.