Hallo,
ich denke das hilft:

WDSC V5.1 Help Contents Fails Indicating the Requested URL Cannot Be Retrieved
Technote

In WDSC V5.1, users select Help from the IDE title bar and then select Help Content. The following message is received: Requested URL could not be retrieved.

To fix the problem, do the following:

Note: On earlier version of Internet Explorer, the titles and location of boxes may be different

1 From the browser (Internet Explorer V5.5 or V6.0), select Tools.
2 Select Internet Options.
3 Click on the Connections tab.
4 Click on the LAN settings box.
5 Click on the LAN setting screen, and select Use a Proxy Server .
6 An Advanced button is shown. Select the Advanced button.
7 On the next screen, a box is shown that says Exceptions .
8 In that box, add the localhost name, and click OK.
9 Uncheck everything in the Automatic Configuration box.