My phone keeps on turning wifi off by its self and screen goes dim, how can I stop this?

Aug 28, 2015
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My phone keeps on turning wifi off by its self and screen goes dim

i recently got an android system warning saying "Virus is attacking your phone! Personal photos, passwords and credit card information are at risk! Press ok to download Antivirus app to remove virus! " i downloaded AVG antivirus that did nothing so i tried 360 security that also did nothing then i tried CM security that also did nothing. i don't know what to do. and also today morning i noticed something downloading i didn't download anything when it was finished it was clash of clans even though i already have clash of clans downloaded on my phone downloaded it again! now i have two clash of clans icons on my phone i don't know hat two do? plz help