Schedule to shutdown your Windows XP

I was downloading some mp3 by emule yesterday night.
When I want to go to bed, there are still 40 minutes. How can I do? Turn off it or leave it on whole night?

OK. I use a command to schedule to shutdown my computer in 1 hour.

Click start > Run,
Enter cmd,
Enter

shutdown -f -s -t 3600

It means after 3600 seconds, the computer will be forced to shutdown.
-s Shuts down the local computer
-f Forces running applications to close.
-t xx : Sets the timer for system shutdown in xx seconds. The default is 20 seconds.

If you want more detail of this command, click here.