Loud Beep...then shutdown

how can i fix or know that i have a malicious program in my PC?
Yesterday i was trying to burn a movie. First i have to decrypter and i used dvd shrink (i have been using this program for a year now) and after i back it up (100%) I heard a loud beep and then it shut down. I re-started 5 more time and try to do the same and i have the same output.
Can anybody please advise?

 

OK
I used the "dvd shrink" to decrypt and sonic to burn.
When it finished to analyze the movie (next step is putting my blank dvd and use sonic to burn it) it makes the beep and shutdown.
When i rebooted i see the movie in the folder.

 

Another scenario.
I have Thunderbird by Mozilla as my email client.
When i check for my new messages it does the same after i finished downloading the messages makes the beep and then shutdown. This has been happened for the last 5 days. The dvd burning just happened yesterday.
I don't know much about this but it looks like a malicioous program that is running in the processes or something like that.

 

thanx for the info TimW

 

Event viwer is the most common thing to NOT look into, when there is an error. What I mean by this, it is one of best troubleshooting tools out there.

Another thing to look into is removing the "automatically reboot" options with:

Right click on MY COMPUTER, select PROPERTIES, then the ADVANCED tab, then under START UP AND RECOVERY hit SETTINGS. Now, Uncheck "Automatically Restart".

Press OK, OK. Now, if this were to happen again, you should see that a possible BSOD (Blues Screen Of Death) appears. This is also a good trouble shooting note to look into.

Escpecially if it gives ye a file, or a 0x000000xx error.

In addition a memory dump should be placed within: c:\windows\minidump. These files are very good info on what happened at the time of the issue.

Recently, in your situation and mine, I had the same issue. I found that my CPU fan was bad, I replaced it, and now more issues came to me.

 

thanks a lot for the tips.

 

One note, minidump files require additional learning on how to interpret them. An excellent tutorial is found here:

http://forums.majorgeeks.com/showthread.php?t=35246