All I said was -

"Just to mention - 512 RAM is pretty small amount for audio, but if it is working well for you, that's cool."

How is that saying you can't record with it?

If it is working, cool, use it!. I was just saying it is a low number, and IF you did have problems it may be something to check. A stick of RAM is pretty cheap (and may turn that XP machine into a monster recording system). Mac was saying to try the XP system also - you have it working you said, so see how it responds thru a whole song project, you may be fine. As for how long do you have, you should get years out of it.
I prefer XP with 512RAM over any vista machine at this point. The Vista machines I have dealt with all needed a lot of settings changed to work smoothly. Just my experience, not a rule.

I do not work here, but the benefits are still awesome
Make your sound your own!