this is all good info folks, thankyou. Stwert:- uh-oh, changing to a 64 bit OS, that sounds costly/complicated? It is a desktop though, not a laptop. I dont know that I would trust myself to start opening up the thing though. I cant remember where, I think it was on here, that I heard some bad things about 64 bit OS's. And wouldn't anything I have installed for a 32 bit OS then be defunct? Chirone :- Again, I think going into the computer itself would be something Id prefer to leave to someone who knew better what they were doing and what they were looking for. daverave.:- I often have PS and sometimes Maya open at the same time. But I also get the errors when Z is open on it's own