connecting dial up to CITRIX

I need to connect via my dial up Modem to
a remote Citrix server everytime I try it
connects then shuts down to blue screen.
HOW Come?? I have a Rockwell hcf 56 k modem
connecting to a Citrix metaframe 1.8 server.
I have reloaded the software….where do I
go to update my modem or does it need updating?