Administrator logon, it logoff suddenly windows xp

I have windows xp version software in my laptop. Recently, we installed some free antivirus and after completing the installation, system got reboot and further it is not working.

It is booting, when I logon immediately it goes logoff and turns back again to logon window.
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More about administrator logon logoff suddenly windows
  1. Log on in safe mode and restore computer on back dated .
  2. sk
  3. :o
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