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

Do the following test:

Open a Command Prompt and type: tnsping instance_name

where instance_name is the name of the instance you want to connect (if it's a XE database, use "tnsping xe"

If it returns ok, follow steps of Der Wolf's answer. If doesn't return ok, follow steps of Annjawn's answer.

It solved for me in both cases.