Need an antivirus for a weak laptop?

Question

Windows

I tried almost everything, they load the system very much

Answer 1

These are incompatible things.
It is better to put an alternative DNS.

Answer 2

if updates are enabled, use the standard windows defender. It is in Windows since XP.

Answer 3

I propose an alternative option: do not install an antivirus, but freeze the system, then even if you caught a virus, after rebooting Windows is like new!