Installing winlogon exe unable to locate component

please in the beginner ..when i log on computer immediately write like this....winlogon.exe unable to locate component this aplication has failed to start because sfc_os dll was not found re-installing the allocation may fix this problem
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More about installing winlogon unable locate component
  1. some virus my corrupted you winlogon file..
    if have xp cd & have some idea to do it without any mistake try this

    http://www.webtree.ca/windowsxp/repair_xp.htm

    or else get help from those have some experience with Systems
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