JSI Tip 8443. You cannot run executables, or program add-ins, that are downloaded by using Internet Explorer, or Outlook Express, on Windows XP SP2?

The subject behavior will occur if the file is blocked because it contains an invalid signature.

To workaround this behavior, you can unblock a trusted publisher:

1. On the Internet Explorer Tools menu, press Manage Add-ons.

2. Press the name of the add-in.

3. Press Update ActiveX to replace the add-on with the current version.

NOTE: Not all add-ins will have this option.

4. To enable an add-in, select Enable and OK.

5. To disable an add-in, select Disable and OK.

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