If you're not familiar with the solution you can find a lot of content (video) via search engines.
Below is one link I found with the search term "arcsight videos on youtube"
There is an uninstaller for Logger.
There should be more information in the installation guide about uninstalling Logger.
You also may have to remove directories.
A reasonable methodology is to snapshot the virtual server prior to installing Logger and revert to that snapshot if you need to.
Why are you doing the uninstall?
Do not try to re-install Logger unless you are sure all of Logger has been uninstalled and removed.