http://libguestfs.org/virt-win-reg.1.html
Install guestfs tools
yum install '*guestf*'
Create file computername.reg
[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ComputerName\ComputerName] @="mnmsrvc" "ComputerName"="OracleClient_1" [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Control\ComputerName\ComputerName] @="mnmsrvc" "ComputerName"="OracleClient_1" [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Tcpip\Parameters] "Hostname"="OracleClient_1" "NV Hostname"="OracleClient_1" [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\Tcpip\Parameters] "Hostname"="OracleClient_1" "NV Hostname"="OracleClient_1"
Execute
virt-win-reg -merge oraclient-win7 computername.reg