Windows Vista/Seven Messenger to a Specific Username

:Start
@Echo Off
Color A
Echo: Please Note, that MSG does only work with Windows Vista and 7; Windows 8, 8.1 and 10 are not Supported, because they have removed the messenger-feature. For Windows XP, use NET SEND.
Pause
:1
Echo OFF
@Net Start Messenger
@REG.EXE ADD "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v AllowRemoteRPC /d "1" /t REG_DWORD /f
CLS
ECHO:The Chat is now activated. Your Computer's Name is:
HostName
@echo off
:A
Echo Your Computer:
HOSTNAME
Echo:
set /p S="Which Computer should recieve your message? Computername (All logged users):"
set /p u="Which logged user should recieve your message? Windows-Username: "
set /p m="Please enter your message here: "
@MSG %U% /Server:%S%  %m%
ECHO:
Echo:Message to %s% Sent from
hostname
ECHO:
ECHO: Sent Text at %DATE%; %TIME% to %u%:
Echo %M%
ECHO:
echo Press any button to send another message.
Pause >NUL
Goto A
:: Made by Skype: Captain.TechLord