What to do when apps are automatically installing on the Micromax Canvas Fire A093?

I'm using Micromax canvas A093 in my device apps automatically installing .when i uninstall those apps again those app installing automatically . So i installing antivirus after scanning my device it show your phone effected by severe trojan but its antivures app doesn't remove those viruses. i tried number anivirus app but that could not resolve issue.please help me ..

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