Problem with dbexport

Hi folks, My first posting seems to have vanished so here goes again. I'm currently running Informix Server v7.31 on NT4. Anytime I try to run dbexport, or for that matter any executable in the \\informix\\bin folder I get the following message: 'Could not initialize the security subsystem. Please ensure that this account has the necessary privileges' I have logged on as informix, so what is the problem? For the moment Informix is installed on a client machine rather than on the server but I get this error even when logged on as informix on the client machine. Thanks in advance, Michael.