When I type on a MacBook Pro (2013), which is Boot Camp'd with 5.0, the built-in trackpad interferes while typing under Windows 8. While typing it will place the cursor on random lines. Apple does not have a fix for this on their website that I can find.
Device Manager/Human Interface Device shows Apple Multitouch and Apple Multitouch Mouse drivers as up to date. I tried updating the drivers and pointing to the local bootcamp/resources folder.
I can't find under windows 8 where I can even see the trackpad options. Do I need to install 3rd party software to be able to disable the trackpad while typing or reduce sensitivity? I've seen references to Trackpad++, but it doesn't support Windows 8.
Best Answer
There do seem to be third-party apps for this that run in Windows. I found this one, that sounds like just what you need :
http://www.addictivetips.com/windows-tips/auto-disable-mouse-touchpad-when-typing/
(Edit) there is also another one here for Windows 7 : http://www.pcworld.com/article/204693/Disable_Your_Laptops_Touchpad_While_You_Type_Windows_7_Edition.html