Unable to load DLL (OraOps9.dll)

I am trying to use a Web Service to access Oracle database using ODP.NET from download OraWin9204.exe.
The Web Service is running on Server 2003 under the (usual) principle "NT AUTHORITY\NETWORK SERVICE" which has read/execute/list folder permissions on the entire C:\oracle folder on the web server.
Client returns the error "Unable to load DLL (OraOps9.dll)"
The Web Service has a AssemblyKeyFile that is trusted by the client.
Any Ideas?

OK. Got it working. Had tried all the stuff in previous posts (PATH/ Restart IIS/ Permissions)
Rebooting the Server fixed it. I hope no-one else wastes a day on something that could have been documented!

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