Just a wild guess but you didn't install any drivers. Naughty naughty.
The touchscreen needs drivers. Download and install Touch Kit. Do a google for "touchkit drivers" and you'll find a ton of sites.
Just because it works doesn't mean it is working properly. The drivers that it is using now, are all the unoptimized bundled drivers. For hibernate and standby you need to install video drivers. Also enable hibernation by going to system prperties --> hibernation and enabling the boxes.
You really should know this if you are going to do a CarPC because you are going to have one hell of a headache if you don't even know rudimentary xp things.