After unplugging power iMac all system preferences are back to standard

So what can i do to keep all my system preferences safed?
Who can help me out
thanks

PRAM/NVRAM reset. http://support.apple.com/kb/ht1379 You won't lose everything.
Boot in Safe Mode. See What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392 Takes a while to run, but it usually "fixes" problems.
 Cheers, Tom

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