That's an edited version of a reply from 4/20/04 where I mistyped:
-----------------------snip------------------------------------
The fix is:
Start -> Run -> Regedit
Navigate to:
"HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Clsid"
(HKCU = HKEY_CLASSES_ROOT)
Right-click the folder icon for this key & select 'Permissions'
Click 'Advanced' -> click 'Add' -> type "System" -> click 'OK'
Put a check in the 'Deny' column for the 'Set Value' permission.
'OK' your way out.
-----------------------------end snip----------------------------
My later replies have been:
------------------------------snip---------------------------
The fix is:
Start -> Run -> Regedit
Navigate to:
"HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Clsid"
(HKCU = HKEY_CLASSES_CURRENT_USER)
Right-click the folder icon for this key & select 'Permissions'
Click 'Advanced' -> click 'Add' -> type "System" -> click 'OK'
Put a check in the 'Deny' column for the 'Set Value' permission.
'OK' your way out.
--------------------------end snip---------------------------------
Sorry for any confusion

Keith
Kieth and Kelly,
Surely you mean current user not classes root.