Why would you want to do this to begin with? It's like pulling a 27ft boat with a 4 cyclinder pickup... it'll do it, but you will end up killing your system later on. There is a reason why Microsoft has these requirements. Vista is a memory hog, and to be honest, Vista isnt worth anything if you can't use it to it's full maximum potential. I have a 1.5 ghz cpu with 1.5GB of ram and it runs very slow on my machine... I would rather have my OS run smooth, than try to get the latest OS. Just my 2 cents.