I would say that is a bit off - there is absolutely no need for anymore than 2GB on an XP platform. I'm not sure if it has been fixed in Vista, but XP could only access 3.2GB of RAM or so even if you had 4GB installed. If you use 32-bit Vista, you dont need anymore than 2GB of RAM. If you want to go higher, just get the 64-bit version.
Vista doesn't actually use as much memory as it appears to, because that is precaching and when a program actually needs the memory, it frees it up. And get the new Alcohol 120%. For some reason, Vista does not like the older versions of media burning software such as alcohol, nero, etc.