Sony laptop continuously restarting how to get desktop screen or start

My laptop model is sony vaio VGN-CS290.
Message on screen is configuration updates:Stage 3 of 3-0%completed Please do not turn off your computer.
, after a few seconds, shutdown and starts restarting.this is happening continuously and never get a desktop screen. Please help me to fix this problem.why is its happening.
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More about sony laptop continuously restarting desktop screen start
  1. I think there is an update error. Can you go to safe mode?
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