Batch Log-In System

rem Thanks for using my system. Kosa#4761
@echo off
title Log-In System
color f0
:Main
cls
echo Welcome!
echo %time% / %date%
echo.
echo 1) Register
echo 2) Log In
set /p choice=
if %choice%==1 goto Register
if %choice%==2 goto LogIn
goto Error
:Register
cls
set /p username=Enter your username:
cd C:\
md %username%
cls
set /p password=Enter your password:
cd C:\%username%\
md %password%
cls
echo Complete!
goto Main
:LogIn
cls
set /p loginName=Username:
cd C:\
if exist %loginName% goto PasswordLogIn
if not exist %loginName% goto Error2
:PasswordLogIn
cls
set /p loginPass=Password:
cd C:\%loginName%\
if exist %loginPass% goto LoggedIn
if not exist %loginPass% goto Error3
:LoggedIn
cls
echo You have been logged in as %loginName%
pause >nul
exit
rem Remove exit and add your instructions here.
:Error
cls
echo Invalid Choice
pause >nul
goto Main
:Error2
cls
echo Invalid Username
pause >nul
goto Main
:Error3
cls
echo Invalid Password
pause >nul
goto Main