its better u do in windows platform because on linux it wont run fully and still u want to then there are some linux which provid a good form of .net eg.suse

listen go to bios setting and there is a hardware password option select it and then give the password which u feel like and save and exit . The next time you boot in first u will have to enter password and your windows will boot.try it i have done it :)

yes they do just pay attention that u install 2005 first and the 2008.remember for anything put version vice first the older then the new.