Since you are running IE7, I'm guessing you were online at the time, maybe even using a wifi network. If so, there indeed are other computers connected to yours and I suppose Windows may have detected some networking activity. Conceivably (though unlikely) somebody may have established a Remote Connection to your system. I'd make sure that I had file and printer sharing disabled and the Windows firewall enabled on whatever network connection you are using.
If you have recently used a Synchronization tool to sync up files, even to a removable disk or memory card, this can sometimes leave a file sync operation in limbo and generate this sort of message.
Have you ever used Briefcase for anything on this computer?
That suggests and incomplete folder sync operation, then. There may be a pending action for some folder that is related somehow to that link and Briefcase is still trying to do something with it. Something arcane, no doubt.
Try creating another shortcut to the same page, storing that shortcut somewhere else, and see if it still gets the Briefcase error message. You may have to delete that link or maybe even the folder it is stored in to clear the problem. Or run Briefcase again so it can finish up? I don't know - I stopped using Briefcase because of these bizarre things that happen occasionally. I just copy whatever files and folders I want manually, cause then I know what I'm doing and how - no Windows magic involved!
Someone on another caravanning forum upgraded their Firefox browser to the new 2.0v and they lost all their bookmarks as they call them on FF,another member suggested he visit this link http://www.loosewireblog.com/2005/11/recovering_your.html
I know its not IE7 but the problem and solution may be similar?
When someone loses their bookmarks in Firefox, it's almost always because they created a new profile. If you start Firefox with the command:
it will run the profile manager and you can select the old profile that contains all the previous bookmarks, extensions, and other customizations. Even if the bookmark.html file is corrupted, Firefox keeps several generations of history on the file. See the Firefox help site for information on how to locate the profile folder and the bookmark history files.