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How to disable autorun in NT 4.0

Run regedit to change the key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\CDROM\Autorun from 1 to 0.


How to change the background for the login screen

Run regedit and change the following keys: HKEY_USERS\DEFAULT\CONTROL PANEL\DESKTOP


How to remove registry entries using .reg files

A key, all it's values, all it's subkeys, and all their values can be deleted by prefixing the key name with a hyphen:

[-HKEY_LOCAL_MACHINE\delete_this_key]

Individual values can be deleted by "setting" the value to a hyphen:

[HKEY_LOCAL_MACHINE\somekey]
"delete_this_value"=-