Thanks for the suggestion. Yeh, I'm pretty sure I've been having severe paged pool memory issues ever since I got my new rig. Halo 2, Portal, Hellgate London Demo and a couple of other games I can't remember have all been having a crash fest on me they all crash the same way (screen goes black, looping sounds). Gave your suggestion a go and it seemed to do the trick but I can't be 100% certain, only gave it around 5mins. After I gave Portal a go, decided to see if the Hellgate demo would work but it still had the same problem. Will get around to trying Portal again when I have time (longer than 5mins this time) and hopefully I'll be able to play the whole way through. Thanks again.