OK, I was on the same boat.
I have a ZX4931, an older one, but I guess with the same IdeaCom touchscreen.
Gateway is pretty slow on updates, as well as the MS.
I was digging in hardware IDs and etc and tested a couple of drivers.
Found I working, but somehow it recognizes only 1 touch (though 2 points are capable with the touchscreen)
OK, here we go...
First download the IdeaCom driver (Win7 x64) from MSI webpage.
Service & Support > Download > All-In-One PC (under Option 2), Entertainment series > 19" Series > Wind Top AE1921 > Driver.
Switch to WIndows 7 64 bit.
Download "IdeaCom Touch Panel Driver" Driver Version: 3.3.0000.13
http://msi.com/service/download/driver-13890.html
After the download Extract and Run in Windows 7 compatibility mode and run as Administrator.
Let it install, after the reboot the touchscreen should be working.
2 shortcuts appeared on my Win8 start menu (for configuration and testing)
I hope it helps.