Avast Free 2014 Password

Hello guys,

My uncle have a laptop. He asked me to help him with some stuff on it.
I decided to install avast int it. For my surprise, someone already installed it sometime ago and defined a password for it. So I cant change the settings (Associate this instalation with my account so I can monitore it, enable the hardened mode, enable / disable and even uninstall avast).

Is there a easy way to solve it, without the need to uninstall?

Thanks for your help!

No, you will need to do a real clean install of avast.
https://forum.avast.com/index.php?topic=147943.msg1074614#msg1074614