Manipulating Registry from a Batch file

REGEDIT /S addsome.REG                Adds registry settings from a file

REGEDIT /E d:pathfilename.REG "HKEY_XXXXWhatever Key"   Exports a a registry hive to file

Example of a registry import file

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinlogon]
“AutoAdminLogon”=”1”
“DefaultDomainName”=”LABDOMAIN”
“DefaultUserName”=”user”
“DefaultPassword”=”password”

Deleting a registrykey

[-HKEY_CURRENT_USERDummyTree]      Deletes the entire tree DummyTree

[HKEY_CURRENT_USERDummyTree]       Deletes ValueToBeRemoved from DummyTree
“ValueToBeRemoved”=-

Source