In IIS, change the Home Directory setting of the Web Site that WebPurchasing is installed to back to its default folder.

1. Open IIS Manager
2. Right-click on the Web Site that the WebPurchasing web application was installed to.
3. Select Properties.
4. Select the Home Directory Tab.
5. Change the value for 'Local path' to its default setting (For the default web site this is usually C:\inetpub\wwwroot).
6. Click OK.