This is not going well, so I turn to the collective wisdom (meaning Greg, really).
Running NW4.11 (don't ask, Greg) with an Athlon Slot A 650Mhz CPU and 640M of RAM.
Everytime I try to run the client, it will start up, but then abort after about a minute, complaining that it can't allocate memory. There is also a message about Short Term Memory Allocator tried 3 times to get memory.
Any clue here?