CMD PROMPT>reg.exe delete /?
REG DELETE KeyName [/v ValueName | /ve | /va] [/f]
Machine Name of remote machine – omitting defaults to the current machine.
Only HKLM and HKU are available on remote machines.
ROOTKEY [ HKLM | HKCU | HKCR | HKU | HKCC ]
SubKey The full name of a registry key under the selected ROOTKEY.
ValueName The value name, under the selected Key, to delete.
When omitted, all subkeys and values under the Key are deleted.
/ve delete the value of empty value name (Default).
/va delete all values under this key.
/f Forces the deletion without prompt.
REG DELETE HKLM\Software\MyCo\MyApp\Timeout
Deletes the registry key Timeout and its all subkeys and values
REG DELETE \\ZODIAC\HKLM\Software\MyCo /v MTU
Deletes the registry value MTU under MyCo on ZODIAC