Hey bud I have the same setup, Windows 8 on my IQ500 series all in one. I installed the drivers and had to manually find the intel 965 drivers for the display but the touch is still not working. Is there anyway you can help me out to try to make the touch work. maybe, if you can send me the drivers for it. It'l be much appreciated. Thanks.
Installed what drivers? I installed Windows 8, albeit on an IQ505 (your model may be different), and all drivers required were included in Windows. The touch screen worked just fine right after install. It only worked with one touch input though. To get two-point working, I had to install the driver from Next Window. Just last week I was perusing their website to try to see if they had updated their driver, as after installing it, the onscreen keyboard got very very small and was unusable. They no longer have the driver available on their website!!! I don't know why, but I have it stored at home if you'd like it, just send me a PM and I will send it to you!
Also, if you seem to think your touch screen is always touching in the top-left corner, you can do a hardware calibration by tapping the scroll lock 5 times quickly. You'll hear a beep and your mouse cursor will move. Touch the mouse cursor everywhere it moves until it's finished in the middle. This has saved me a few times when I couldn't get it to work!