I have had a Web application that worked perfectly before I upgraded to SP1, I think I have narrowed the problem down to MDAC 2.5, I hope.<BR><BR>My application now shows the following error:<BR><BR>Microsoft OLE DB Provider for ODBC Drivers (0x80004005)<BR>[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified<BR><BR>which can&#039t be correct as it worked before SP1, and I made no changes to the source.<BR><BR>Can someone please help me?