In my PC avast can not put an app call McAfee in quarentin

Pls help

I’m afraid there is little information to even try to suggest what to do.

A screenshot of the Avast Alert window with the See details option selected might help.

What are you doing when you get this issue ?
What operating system ?
What Avast program version number ?

McAfee is a legitimate security program. Why are you trying to put it in quarantine instead of uninstalling it?

Whilst it may be a legitimate program it is also a security based program and if live (e.g. on-access/active) there is a chance of conflict with Avast and or detection of is virus signatures.

This is why I asked for more details from the OP.

Who is to know the reason why Avast can’t put it in quarantine, only the OP.

it can not be uninstalled(in my pc) that is why i tried to put it into quarantine then delete it from there

Why can’t you uninstall? What error message do you get? Have you tried the McAfee uninstaller?
https://www.mcafee.com/support/s/article/000001616?language=en_US

There is still little in the way of information to offer any constructive advice.

This is why we ask questions to get that information to try and help.