#1: don't worry about it, ATI drivers are ever buggy but generaly "work"
#2: when you install an ndiswrapper driver, it installs all the drivers that come in the bundle. Though it should only load the one you tell it too, double check the config and make sure its only loading the one driver. Aslo, if the wireless isn't integrated, i don't know how ndiswrapper acts when the card isn't inseted on boot.
#3&4: 3 is related to 4, and 4 tells you what you need to do to enable compositing. If you don't want compositing you may have to ask over at x.org how to keep the error from happening, also report a bug on ubuntu, sounds like a bad default setup to me.
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