If you want to Reinstall AVG Antivirus then flow this steps:
In the first step go to this Link: AVG.com
After clicking this link open homepage, select the green button labeled, “Free Download”.
After clicking the Free Download button, a download button should appear in the bottom left corner of the browser. When it is done downloading, click the button.
The program will ask if it’s okay to make changes, Click Yes. The program should open up welcoming the user to AVG. Click Continue.
After clicking continue, select the Basic Protection and click Install Now.
When the program is done downloading, the program will ask if you wish to download the AVG Web Tune Up. If you wish to do so, keep the box checked. If you do not wish to download it, uncheck the box. Click OK.
The program will ask if you wish to set up an account. If you do, type in your email and password, and click Create Account. If you do not want to set up an account, click Skip for Now.
The program should be set up.