No access to desktop windows 7

I can\'t access my desktop there is grey screen with a place at bottom to type somethin if i type somethin press ok it says incorrect voucher i cant even accesss my task mananger
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More about access desktop windows
  1. You have a virus, boot into safe mode by7 pressing F8 repeatedly just before Windows starts and enter safe mode, if you can, do a system restore to a date before you were infected, if you can't do a system restore, then run your anti virus program. If that fails then do what it says in the above link.
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