OK, do a KB search on MS support site (
http://support.microsoft.com/servicedesks/msdn/) for Article ID: Q240982
>We have a multi-user database program written in FoxPro 2.6 for windows. The program was running fine on all our machines but, recently two users have started getting an error called "I/O operation failure" when they try to log into the database program. Both of them have NT machines. Do you have any idea what it might be. I notice some of the users in this group having these problems. Thanks.