Hi,
Setting Internet Explorer as the default browser from Control Panel> Add or
remove programs> Set program access and defaults will probably fix this. If
it does not, you may have to make a registry edit.
Do you have this registry key?
HKEY_CLASSES_ROOT\CLSID\{c90250f3-4d7d-4991-9b69-a5c5bc1c2ae6}
Reference:
http://blogs.msdn.com/ie/archive/2005/12/16/504864.aspx
You should not have this key with IE6. An update for IE6 may have created
it. Installing or updating Firefox may have created it.
Installing/uninstalling IE7 may have left the key behind.
If you find that key in your registry, Export it (just in case) Delete it.
Restart.
If you're not familiar with regedit, please post back or seek help.
Hope this helps,
Don
[MS MVP- IE]