There can be lots of different causes and we might need the all sw & hw details to pin point that but I think in that case:
That can be caused by a defected hardware, most likely RAM or HDD (Or it might be the mainboard). Try to change your RAM stick(s) with one(s) from the working machines and try again.
Another cause might be the small Pagefile (virtual memory) setup, if your are not sure about it check it too and it should be set to at least 256k.
Or that can be caused by some bad dll's which might be replaced by some software installed previously..
and finally have you installed final windows service pack and Photoshop 5.0.2 update?
http://www.adobe.com/support/downloa....jsp?ftpID=205
I hope that helps..