Apr 27, 2012 12:57 AM|Dino He - MSFT|LINK
It's a common issue.
You can try this:look for multiple copies of the OCIW32.dll file on the IIS server. There should only be one copy of this .dll file on the computer, and it should be in the \Bin subfolder of the Oracle home folder. If you find other copies, rename these
with a .bak extension and then retest connectivity. You may want to restart the IIS services after renaming any additional copies of the .dll file that you found.