registry
To remove a value, set it equal to "-":
[HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify]
"PastIconsStream"=-To remove a key, place a "-" in front of it:
[-HKEY_CLASSES_ROOT\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\Shell\Erasext]» «