Well I'm back with a few questions. I've searched on this forum about this topic, but it didn't make sense. If I read older postings you give the advice not to go for XP OS on your DAW... New postings says that XP is a great OS ( with the famous "Opus-tweaks") So what's the main difference between the performance of the 98, XP and 2 K? Of course you should have soundcard drivers for the OS you're going for. I'm going to buy a M-Audio Delta410 to start with, and later I thought I'd buy a soundcard with A-DAT lightpipe. (RME Hammerfall or the M-Audio ADAT-card) So my question is: Do you think that I should (need to)update from W98SE? Is that something that you also need to do when you add larger HD's ? If so, what should I go for? XP home/Pro or 2k? You also need one of those if you're going to run Cubase SX instead of Logic, don't you? It would be nice to hear what you think about this.