MacBook keeps turning off on start up

My problems started when I kept getting this Hal.dll error msg on starting up my MacBook pro, which I understand is a windows file since I at one time needed windows XP on my MacBook to run a certain program.
When I realized I no longer needed Windows, I started (foolishly?) deleting any and all windows files I saw in my applications folder. I Now realize that probably wasnt a good idea. Ever since doing that, i'd get the above error message when I turned my comp on.
I finally got past this by restarting in safe mode. This worked ONCE, when my ext drive wasn't handy.
When I tried restarting again in safe mode later at home, the computer now keeps turning itself off !!!
Now I get the apple icon, the spinning wheel, the status bar slowly filling, and then it all disappears and the screen goes black and the computer turns off.
I have tried numerous times with power + shift (safe), power + option        (which shows me the mac hd volume, but when I select it will still turn off), power + option+D, and power + shift +s > fsck -fy > reboot  and after all of these attempts the computer still just turns off.
At this pt I just want to get that desktop back one more time to make sure I have the files I want on my ext drive and move on.
Anyone out there have any ideas or advice on how to could get past the computer always turning off on me on start up?

This sounds like the same thing that has been happening to both my Macbook and Macbook Pro. Some others sound like they have similar problems. This is what I posted in the Macbook Pro area regarding the same symptoms. This is discouraging. These computers are expensive and they should have the bugs worked out better than this.
From: Massachusetts
Registered: Mar 5, 2006
Re: Brand New MacBook Pro 2.33GHz dies
Posted: Nov 16, 2006 3:52 PM in response to: Newton
Reply Email
I wonder if I have similar problems. I have both a Macbook Pro 15" and a Macbook 13"
1st my macbook started shutting itself off unexpectedly. It got more and more frequent. I have done several fixes including: archive and install, sending it in to have a logic board replaced, downloading an updated disc utility repair, and sending it in to have a power component replaced. Now I will be sending it in for a third time and I think they will replace the Macbook machine if this repair doesn't work.
Now my Macbook Pro is doing the same thing. I have had it for about 6 months and it was running fine until now. I ran the exact same software on my 12 G-4 powerbook without any problems. One of the computer people at work said it sounds like a power problem. It happens whether it is running AC or on battery power and doesnt seem to matter what I am doing.
I am waiting for the macbook to be fixed before I address the Macbook Pro because I dont want to have both of my computers in the shop at the same time.
Any suggestions? This seems totally unacceptable for two new expensive computers.

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