You still haven't said which
application (i.e. Word, Excel, Outlook, etc). Whichever one it is is probably trying to use a file that exists remotely. There is a range of possibilities. See:
http://support.microsoft.com/kb/2019105/. It could be something as simple as having a USB stick connected to a router or, in Word, the application trying to contact the Office translator. For a discussion of this regarding Word, see:
http://answers.microsoft.com/en-us/o...f-1fcb4d2324bb