You are in the wrong section. This is the Acer Chromebook 11.6" Forum
On a normal CB, there's no way to install AV.
It isn't needed because the apps and files are stored on Googles servers and each process is individually sandboxed.
IF the Play Store is available to your CB, and you install Android apps, it may be possible to install a malignant app, but it's totally unclear if you could install an Android AC app to scan local files. It couldn't do anything to Drive files.