castle link and old computer wows

I'd give the 128 a shot. I know windows 2000 and xp are "different", but I've had good luck getting win. 2000 to work with very low end hardware. I ran it for years on my pentium 3 with 128mb of ram, and I also got it to work on a laptop with an old pentium with mmx processor. Its not like you need to run any other application than just the castle link, if you cant get it to work, see if you can get a hold of 2000 pro and try that, that is if the castle link will work with it.