Warda, have you gotten an answer yet. This I s driving me ....CRAZIEIER
LOL
Use Google to backup your contacts or export them to an SD card. Copy your photos to your laptop/computer whatever or use whatever cloud service you prefer (dropbox.) Hard reset. In the future, read some of the reviews of the apps/games your installing. be especially leary of 'free games' on the PlayStore. For some reason, Google doesn't consider in-your-face ads as malware.
Lastly, you can use 'AppOps' to strip applications of their respective permissions. This particular app is NOT avaliable on the PlayStore but if you're interested PM me and I can find it for you. This is only to be used for a must-have app that is behaving poorly. I would hard reset before I used any sort of Anti-Virus, but that's just me.
After you've backed everything up, power down, hold down power up and volume and whilst holding those press and hold power. When 'Recovery booting' appears release all keys. Use the volume rocker to highlight Reset to factory and 'power' to select. set everything up and I highly suggest once you're back up and running go into the playstore and disable auto-update. Reinstall one app at a time and observe behavior.
Using these methods, I have NEVER needed to use any antivirus on my phone...then again, I simply don't use 'free games' any few free apps (Facebook, whatsapp, google maps well known devs being the exception) if in doubt, google it.