OraOLEDB.Oracle provider is not registered on the local machine

Question

I just migrated from XP to Win 7. I am guessing this error has to do with switching operating systems. I wrote a .net application that basically massages a large amount of d

Answer 1

I had the same issue using IIS.

Make sure the option 'Enable 32bit Applications' is set to true on Advanced Configuration of the Application Pool.

Answer 2

After spend hours to fix that; and for some who installed it uncorrectly, you need to uninstall current version and reinstall it again as Administrator

Answer 3

If you have windows 64 bits, try to install oracle driver 32 bits first then 64 bits driver, thats what i do and is working

Answer 4

If you are getting this in a C# projet, check if you are running in 64-bit or 32-bit mode with the following code:

        if (IntPtr.Size == 4)
        {
            Console.WriteLine("This is 32-Bit!");
        }
        else if (IntPtr.Size == 8)
        {
            Console.WriteLine("This is 64 Bit!");
        }

If you find that you are running in 64-Bit mode, you may want to try switching to 32-Bit (or vice versa). You can follow this guide to force your application to run as 64 or 32 bit (X64 and X86 respectively). You have to make sure that Platform Target in your project properties is not set to Any CPU and that it is explicitley set.

Switching that option from Any CPU to X86 resolved my error and I was able to connect to the Oracle provider.

Answer 5

Building on Der Wolfs tip, I uninstalled the Oracle client and installed it again, right-clicking on the setup program, and running it as Administrator. It worked.

Answer 6

I had the same issue but my solution was to keep the Platform target as Any CPU and UNCHECK Prefer 32-bit checkbox. After I unchecked it I was able to open a connection with the provider.