Thank you for your help. But I have already resolved the issue with the help of this article that suggested the same to disable Avast and re-enable it. After doing the tasks properly, the problem got solved. There was no problem while installing this. Anyway, thank you so much everyone.

Greetings to all, This is Houston and I am a new member on this forum. Actually I tried to install GhostBSD on my PC. But when I am trying to install this, Avast would not let me run a program. I have no idea what could be the issue. Could anyone please help me to fix it?