This is an authentication problem which can be resolved as follows: 

- Open Explorer and select the ORACLE_HOME directory, e.g. c:\Oracle\Ora92 Be sure that you have Tools - Folder Options.. - View  

- Use simple file sharing unchecked Right click on the directory and look at its properties. 

Go to the Security tab and select Authenticated Users. 

Unclick and then re-click the Read & Execute permission under the Allow column. 

Click the advanced button and ensure that the Authenticated Users entry allows Read & Execute on This Folder,subfolders and files. 

Click OK and then Apply. 

Reboot the machine and all should be OK.fails,  

If this fails, try : 

regsvr32 ORACLE_HOME\bin\oraoledb.dll