AVG BLOCKING STEAM GAMES help me please

Hello, Khaled.
It's unfortunate that you are experiencing issues with re installing AVG Anti Virus free. Let us the exact error message if the setup generates any. Was the Avast software uninstalled successfully or did you encounter any issues?

AVG please help me
its long story, see i took the PC to a tech , to format it , then he installed avg antivirus, when i wanted to play steam games (payday 2, SAS4) they didn't launch ,they used to work before , however , deleted the AVG antivirus, and downloaded AVAST antivirus , but still , the games didnt work , so i went to steam community and asked for help , they said if you have AVG antivirus , you need to disable it and add steam exception , so , what i did is deleted avast and downloaded AVG antivirus again , but it didn't work , i mean the installation fails 
help me please

Hello, Khaled.
It's unfortunate that you are experiencing issues with re installing AVG Anti Virus free. Let us the exact error message if the setup generates any. Was the Avast software uninstalled successfully or did you encounter any issues?