I sell a small shareware. I recently got a mail from a customer saying the he is getting error :" [Microsoft] [ODBC Driver Manager] Data source name not found and no default driver specified". He added that he reinstalled software but it made no difference and that he has XP with latest patches. I use MDAC2.1 that I do not include in the package. . Any ideas on what might be going on here and might have caused the software to stop working? Any ideas on what I should as the client to check?