@ silverjenny698
It really is hard to recommend something for someone else not knowing their requirements.
Also you haven't said what your are using right now ?
Avast for the most part is lighter than many other Antiviruses.
Given my specifications (below my posts) are a little better than yours. I found Avast Free best suits my needs, but I have only been using it for 19 years. I also don't install all components, basically the core protection File, Mail, Behaviour Shields. I don't install the Firewall and just use the Windows10 Firewall. The more components you install the more likely it could add system load.
Note: that there is a new product Avast One that has more components than Avast Antivirus (Free), I wouldn't recommend that as you have greater configuration options in the avast antivirus (free).