Mac Book turning off at will

Hey I have a problem . My Mac (It doesn't have a year yet) is acting really strange recently . I installed Windows XP on it and it was working fine until February - it turned itself off when I was using Windows , after working for only 3 hours . Since then it turns itself off randomly before I reach the log on screen or when it's on for a long time (on Windows) . I thought that it's something wrong with XP , but it did that a few times while on Mac OS X too . Can anyone help me ? (sorry if I made any mistakes , but my english isn't perfect) Thanks in advance for any help
Mac Book 2GHz 1GB Ram 80GB HDD   Mac OS X (10.4.9)  
Mac Book 2GHz   Mac OS X (10.4.9)  

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It sounds like you have this problem:
http://docs.info.apple.com/article.html?artnum=304308

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