Log in as user.
Browse to HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Desktop\SafeMode\Components
Change the DeskHTMLVersion key from 272 to 0 on both keys and reboot.
If the user has a persistent problem with this, run a Spyware detector/cleaner - malware may be causing the issue.
If the problem persists your can delete the Desktop.htt file from C:/Documents and Settings/Profile/Application Data/Microsoft/Internet Explorer/Desktop.htt"
This can be done remotely by connecting to the remote registry then browsing to HKEY_USERS and selecting the long SID string that begins S_xxxxx(+loads of numbers, without _classes on the end). If you afterwards stop the Explorer.exe process then create a new process in Taskmanager the user should not even have to log off.