When you log off of Windows XP, and your roaming profile is stored on server that uses quotas, you receive:
Windows cannot update your roaming profile.
Possible causes of this error include network problems or insufficient security rights.
If this problem persists, contact your network administrator.
Your System event log may contain:
Event ID: 112
Details: Not enough space to write to the disk.
This behavior will occur if the server detects that you do not have enough free disk space to copy the profile.
NOTE: During the process of saving the profile, the server calculates the space required to store the profile and how much space is available. If the free space available to the user is not sufficient to copy the profile, you receive the subject error.