Requested registry access is not allowed?

Requested registry access is not allowed?

I keep getting this error message in my windows event log and I don't know
what's causing it. If anyone could shed me some light, it'll be
appreciated. Here's the error message that I'm getting:
EXCEPTION: Server was unable to process request. ---> Requested registry
access is not allowed. FILE: ,
METHOD: System.Object[]
ReadResponse(System.Web.Services.Protocols.SoapClientMessage,
System.Net.WebResponse, System.IO.Stream, Boolean)