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  Hi Phil,
  
  A simple method which has worked for me in the past is to unplug the laptop, remove the battery for 30 seconds, replace and try to power up again.
  
  You could also try to start in safe mode by a series of taps on F8 on startup as Gary suggested and then using the Administrator account reset the password on your user account if you normally use one
  
  
  
  
  There's also a chance that the virus Ransomware is the culprit:
  
  http://www.microsoft.com/en-gb/security/resources/ransomware-whatis.aspx
  
  Or the info on this link may be useful:
  
  
  
  If none of these work for you I would suggest a clean reload of the operating system which will mean a complete loss of files so I hope you have a recent backup!
  
  Good luck, keep us posted how you get on.

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