Before opening this solution, set CalcPiWebServiceVB folder as an IIS v-dir named "CalcPiWebServiceVB" (no quotes). You can do this under WinXP by right-clicking on CalcPiWebService, choosing the Web Sharing tab, click Share this folder and entering "CalcPiWebServiceVB" (no quotes) as the Alias.

Also, before running the code that accesses the CalcPiWebServiceVB, make sure to enable anonymous access to the CalcPiWebServiceVB IIS application. You can do this by going to Start->Settings->Control Panel->Administration Tools->Internet Information Services->Local Computer->Web Sites->Default Web Site and right-clicking on CalcPiWebServiceVB, choosing Properties, choosing the Directory Security tab, pressing the Edit button in the Anonymous Access and authentication control group box and clicking the Anonymous access check box.
