win 7 with pretty much everything disabled should run pretty good. i had that on an old slow laptop and had little problem other than the time it took to turn everything off.
i do mean everything like superfetch, search features, indexing and most anything else you can think of to turn off. go into services and have a look see. you can also find lists of services safe to turn off in various places on the web. a nice google search will turn up a few easily
edit: forgot the most important thing to turn off is the aero theme. that was the biggest resource hog. leaves it looking like classic windows but it'll speed things up a lot