Roaming Profiles - locked USRCLASS.DAT

I am using romaing profiles with my terminal clients.
Group policies are set to delete cached profiles after a
user logs off.
Somtimes a profile is not deleted, Instead, the profile
can't be deleted unless the host server is rebooted. If I
try to manually delete the profile, I get an error message
saying that it can't delete USRCLASS.DAT due to a sharing
violation.
The user can not log back on due to a access denied error.
Event 1000 is recorded in the event viewer.
Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1000
Date: 11/20/2003
Time: 1:27:04 PM
User: NT AUTHORITY\SYSTEM
Computer: ICR-TS03
Description:
RegLoadKey failed. Return value Access is denied. for
C:\Documents and Settings\CRAIGV.ICRDOM\Local
Settings\Application Data\Microsoft\Windows\\UsrClass.dat.