So i'm debating on building a rig for my parents. They have an old 1.5ghz 512ram rig so i'm just going to upgrade them to something that will support the bare min for vista. all they ever use it for is web, word proc, and once and a while they use it for burning. So i need some recommendations for some really really cheap hardware, if i can build it for less then 300 that would be amazingly awesome.