将以下代码另存为bat或者cmd文件即可;

@echo
 off
title 更改计算机名不重启
set /p name=请输您的计算机名:
reg add 
"HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\ComputerName\ActiveComputerName"
 /v ComputerName /t reg_sz /d %name% /f >nul 2>nul
reg add 
"HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters" 
/v "NV Hostname" /t reg_sz /d %name% /f >nul 2>nul
reg add 
"HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters" 
/v Hostname /t reg_sz /d %name% /f >nul 2>nul
echo.
echo 修改计算机名完毕