>All of a sudden every Windows 95/98 workstation gets the message:
>"Not enough memory. Quit some programs"
>
>when we try to log on to the NT server.
>
>Some times we can log on but cannot map a drive (we get the same error).
>
>MSN Tech says put the latest service pack on, but we have SP6.
>
>Can anyone help?

I've not seen this happen (I don't run much under Win9x these days) but NT SP6a is out and does address several possible issues for NT Server dropping connections; it sounds like the stations are dropping because something is dying - a flakey connection or NIC in the server, another NIC on the same segment as the server 'jabbering out' and blocking the server from talking, or a network protocol getting dropped are all possible causes.

I'd look to see if all the Win9x stations are using the same protocol to talk to the server; if they are, but other systems relying on a different protocol are not affected, I'd try using a different network protocol, especially if you now are using NetBEUI - it's easy to set up initially, but is a real pig as more stations rely on it to talk.