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Internet Explorer 8 Add-Ons Listed As Not Available

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I'm using Windows XP, Service Pack 3, and Internet Explorer 8. If I click on Tools and Manage Add-Ons, I see a number of categories and then five items listed as Not Available.


Does anyone have any information on Add-Ons that are listed as Not Available? I'm wondering why they are there and whether they are safe.


Here is the list:




Diagnose Connection Problems

Windows Messenger



The first four are listed as Browser Extensions, while the last item is listed as Explorer Bar.


I think most or all of the five items are shown in the Registry under HKLM, Software, Microsoft, Internet Explorer, Extensions. The second item listed as CD67F990-D8E9-11D2-98FE-00C0F0318AFE is basically an empty Registry key and maybe that is why only that long designation is displayed.


Thanks for any help,



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