Autorestart after shutdown

I don't understand why the Acer Desktop's power button has stopped working. There is no problem with the software but the computer doesn't start. The power button has been piece of crap. Can anyone tell me how to do it?

Hello,

I use windows xp sp2 on computer and am unable to boot it up successfully. I am at a loss for what to do.

This is what happened. My computer became infected with a nasty virus so I tried to boot up in safe mode using F8. However I got a blue screen with an error message that said:

"A PROBLEM HAS BEEN DETECTED AND WINDOWS HAS BEEN SUT DOWN TO PREVENT DAMAGE TO YOUR COMPUTER.

IF THIS IS THE FIRST TIME YOU'VE SEEN THIS ERROR SCREEN RESTART YOUR
COMPUTER. IF THIS SCREEN APPEARS AGAIN FOLLOW THESE STEPS:

CHECK FOR VIRUSES ON YOUR COMPUTER. REMOVE ANY NEWLY INSTALLED HARD DRIVES OR HARD DRIVE CONTROLLERS. C...

Desperate need of help! My laptop froze and I had to manually shut it off to restart it. When it restarted it came up with the black screen/white letters that reads:

"We apologize for the inconvenience, but Windows did not start successfully...etc..."

And it gave me options as to continue in "Safe Mode" and to continue normally...I've tried each of the options and each one results in a blue screen that flashes really quickly with white words but my computer shuts off automatically, not giving me time to read any of it. It restarts on its own and does the same thing. I've tried not selecting anything and letting it "start windows" in its own "in 30 seconds". And ...