my android phone has virus

i install some apps to my android 4.2.2 phone,not from play store by removing security of phone by removing tick in "allow apps to install from other sources ".Then i install it.when i go online it stucks the phone.i reboot it.then also it stucks the phone. i did factory reset by using recovery mode.when it reboot it says "Unfortunately app manager has stopped".then it automatically remove the tick of "allow apps to install from other sources " install some unwanted apps.then phone began to stuck.sometimes 'launcher is loading' and stucks the phone. when i remove that virus apps it again and again installs.after a factory reset it doesn't remove the virus.Please help me!!!

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