CreateObject(Mssoap...) on Win7 PC

I am migrating an old vb6 app to a Windows 7 Pro (32) PC, until the app gets rewrittten with newer technology. Everything works fine except the following CreateObject(MSSOAP.SoapClient) which fails with the Error 429 cannot create object. This is a call to a web service within the domain. This PC has the MSSoap30 SDK installed, so I know it's not that. I think it is a write error for a cache or temp file when the instance is created, but I do not know which folder would be used for that purpose. Can anyone advise? Thanks!