Hi. I don't think adding an extra gig of ram will make a lot of difference for what you want to do. Do you bounce your tracks down to audio to ease your system resources? If you use a lot of VST instruments you will easily crash your system even with four gig of ram. You may be better installing vista 64 bit or windows 7 64 bit and you will be able to at least double your system memory. The problem with changing your operating system is software compatibility eg. Ableton live, Cubase. You will have to check if your version will run on it. Until you decide what to do, try things like bouncing down your audio before adding tracks, using less Vsts at one go, muting audio tracks ect. There are various things you can do to help your system.