Debian shutdown

[gunnar]

I've carried out a network-installation of debian-31r4-i386-netinst.iso and my 
problem is that I cannot shut it down. The only way of shutting it down seems 
to be to press the Reset-button, choose my Windows-partition in GRUB and carry 
out the shutdown from Windows. Thank God for my Windows-partition, without it I 
would have to pull the plug to shut down Debian. Can anybody tell me a better 
way of shutting down Debian?
Gunnar Sjöö