yes you would, a barebone kit consists of mainly a mobo, ram, cpu, no hdd. (depending on your choice of barebone some do have hdd) and if it just blew you mobo, why not just get barebone w/o a hdd and then put your hdd then out in your old hdd (yet generally it is better to format and do a clean install of your os when installing a new mobo, but its not required)
ahh id stay away from vista, lots of bugs, but otherwise it looks like a great os