Delete their profile along with the corresponding registry key which can be found in,
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
In the profile list tree are a list of folders that start with "S-1-5-21-000-2323-" and so on, each one of these folders corresponds to a profile. Click each one, and in the right hand pane you will see something similar to "ProfileImagePath" where the patch shown will show the users logon ID at the very end. Find the folder with that users logon ID and delete it. Have the user now try and logon again which should force a new profile to be built.
