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1) The supported maximum official speed is 1600Mhz, so anything else is over clocking so there are no guarantees. In most cases the higher Mhz doesn't really gain you that much as the latency just increases, or you need to increase it in order to get a stable system. I'd recommend setting to 1600Mhz (which is a good sweet spot) so having a stable system with the DRAM having lower latency.
2) Can't help here.
3) I never use the supplied driver CD, they are always out of date. Much better to download all the latest driver and software from Intels download page for your motherboard. I did this and had no issues installing drivers. Perhaps the CD installer was regional for Hong Kong area so wouldn't work on your UI and culture settings?
4) Don't use it so not sure what the issue might be there, sorry.