I have encountered below exception while executing classic ASP application . This exception was occurring whenever my application trying to connect with oracle database. But on same machine other applications were running without any issue. After spending some time I came to know that this issue was occurring because I was trying to run 32 bit classic ASP application on 64 bit machine ( Windows 7 ). Exception: Microsoft OLE DB Provider for ODBC Drivers error '80004005' [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified Fix: Open Command prompt (Run as administrator) cd %systemdrive%\Inetpub\ AdminScripts or go to "AdminScripts" folder under "Inetpub" folder Execute following command- cscript.exe adsutil.vbs set W3SVC/AppPools/Enable32BitAppOnWin64 1 Issue got resolved after executing above command because " Enable32BitAppOnWin64 " is a boolean property and indicates whether to allow 32-bi
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