I've always loved this game! I've lost my previous copy several years ago and now thanks to GOG I have it back.
Several people reported issues when running this game under XP, but I haven't had any problem so far, it runs perfectly on my box (Core 2 Duo, 2Gb RAM, Audigy 2 sound card, XP sp3). I've run the installation program provided by GOG in Win98/ME compatibility mode (see this link for more details: http://support.empireinteractive.com/default.aspx?MID=60568495217F&PID=FC8A19A3-F7F3-4719-A578-86C6120DECAC) and haven't had any problem whatsoever.