Troubleshooting Lab

You are working as a DST for a large company with a corporate network. A user calls and tells you that he has been on vacation for the last two weeks. When he tries to log on to the network, he sees only the default Windows XP desktop with just the Recycle Bin. All his desktop icons are gone and his Start menu is completely changed. He also cannot find any of his files in his My Documents folder. He has tried logging on from several different computers using his domain user name and password, but has the same problem no matter what computer he tries to log on to. Normally, the user can log on to any computer and can access his desktop environment and folders. Other users on the network are not reporting this problem. What do you suspect is the problem?