AVG antivirus 2015 not getting activated

Hello Reena. Yes, you can try reinstalling AVG Antivirus. Please have a look at this link  http://support.avg.com/SupportArticleView?urlname=How-to-uninstall-AVG to uninstall AVG Antivirus. Then, I kindly request you to follow the instructions in this link http://avgread.me/1DXPL5z to install AVG Antivirus. Thank you.

Is it possible to uninstall and reinstall it?

Hello Reena. Yes, you can try reinstalling AVG Antivirus. Please have a look at this link  http://support.avg.com/SupportArticleView?urlname=How-to-uninstall-AVG to uninstall AVG Antivirus. Then, I kindly request you to follow the instructions in this link http://avgread.me/1DXPL5z to install AVG Antivirus. Thank you.