i've download this windows vista but dunno how to install it.. anyone can teach me? i tried using bios to boot, but cant detect. and there is no product key. how to install??

my com takes about 3-4 minutes to load. but once load, the core1 and core2 are always 100% for at lease 1 minute. after 1 minute i only able to use it. for example, once i start my com, while its 100% for both core, i cant click on the wireless connection, it will just hang there. after awhile only can click on it.