Thanks....for the reply....our network served be a Small business server 2000 as a domain. we have purchased a 50 node license, and we 28 machines. The machines that are giving this error are XP/SP2, but what is baffling is that not all the machines that are XP/SP2 are giving this error. of the 15 machines that are XP/SP2, one does not have this error...what is even more baffling is that, when I was running the demo version, there were two machines that did not have this error. I was hoping that, if we purchased a license, this problem would go away....awaiting your helpful response.....Thanks