core 6 issues

[JJ JJ]

Hi guys,
I'd like to ask you a couple of things regarding my core 6 install.
How do I shut it down? I mean, completely power off?
Rebooting is not a problem, but when I choose shutdown, it stops everything, 
and then says "system halted" and that's it. I believe it even puts to sleep 
the hard drive, but the computer is still on.
What should I do?
The second one is about VmWare, during the install it can't find the kernel 
c headers, and I have no idea where they are. Where are they?
By the way, I have the 64 version for pc.
Many many thanks!
Jessica

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