Computer goes to sleep while I'm working

Hi everyone,
I was hoping someone can pinpoint my problem and help me fix it.
My computer goes to sleep while I'm working on it.
Just by itself. Sometimes right in a row.
Does anyone know any tips that I can use.
I copied the contents from Console.app
and here is what I found:
sleep demand recorded: Thu Mar 1 08:14:57 2007\n\n
Mar 1 08:49:24 My-G5 EÊæÔ[137]: sleeptime recorded: Thu Mar 1 08:14:57 2007\n\n
Mar 1 08:49:24 My-G5 EÊæÔ[137]: waketime is: Thu Mar 1 08:49:24 2007\n\n
Mar 1 08:51:46 My-G5 EÊæÔ[137]: sleep demand recorded: Thu Mar 1 08:51:46 2007\n\n
G5   Mac OS X (10.4.7)  

If you have issues with a Mac or display that goes to sleep at inappropriate times, you may have a problem with Energy Saver. Delete the following .plist files and restart:
-/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
-/Users/username/Library/Preferences/com.apple.systemuiserver.plist--
(username is your name or System Administrators name)
-/Library/Preferences/SystemConfiguration/com.apple.AutoWake.plist
A restart is very important after deleting these plists. After a reboot your Mac will then generate new ones.
Cheers!
DALE

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