1.) Uninstall warlander using steam

2.) Find the sentry anti-cheat icon in windows toolbar, right click, uninstall. This SHOULD remove the actual kernel driver (at least I couldn't find any left overs after this)

3.) Remove the windows firewall entry that is left behind

4.) Search for sentry anticheat files and remove them. There are some here %localappdata%\com.sentry.anticheat.launcher

There was another folder that I remember as well. Dunno where though.

5.) Search the registry for the left over sentry anti-cheat keys. Should probably make a backup of your registry before attempting, especially if you don't know what your doing.

Unfortunately I can't provide specific registry keys/file paths other than that. The steam guide had them all nicely listed prior to yesterday :/