Googled around abit n found this at a forum.
How to shutdown a Win2000/XP remotely
To remote shutdown windows 2000/XP, 1) run MMC>Computer Management; right-click Computer Management (local)>connect to another computer; select the remote computer; right-click Computer Management (remote computer)>Properties>Advanced>startup & Recovery>shutdown. 2) use command shutdown \\computername. Note: The specified computer may not shut down when you use the Shutdown.exe tool to shut it down. This behavior can occur if the Unlock Computer dialog box appears on the desktop, or if the computer is locked. 3) Other remote access software such as Terminal Service, pcAnywhere, Netmeeting, VNC and Telnet. 4) Use Shutgui.exe from NT Resource Kit
Hope it helps yah ;D