Facebook messanger and other applications like download managers are not working

My laptop has just spopped downloading from youtube and other sites. I discovered that applications like facebook messanger, IDM internet download maneger, skype, and FDM are not working too. What must i do???
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More about facebook messanger applications download managers working
  1. Have you scanned for viruses/malware?
  2. Ok i just instald a new operating system and it works. thanx guys
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