The Microsoft page where i got this from, doesn't say anything about XP, so i'm not 100% sure it will work.
To Remove a Custom Internet Explorer Window Title
Using Registry Editor, delete the following value in the registry:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Window Title
When you delete this value, "Microsoft Internet Explorer" becomes the default window title.
That worked for IE, but I still have the same problem with Outlook Express. I tried looking through the registry, and I tried searching the Microsoft site given above, but no luck. Can anyone help?