where did you download it from?
plug-in
https://www.google.com/earth/explore/products/plugin.html
they have a support page btw for uninstall (same directions as Duane posted)
https://developers.google.com/earth/#installing_the_google_earth_plugin
google earth
https://www.google.com/earth/download/ge/agree.html
google earth pro
https://www.google.com/earth/download/gep/agree.html
if you grabbed any of these from another site they may not be legitimate installs, but they are not virus (it would have been widely reported if something this mainstream was illegitimate) they could be adware or some other nonsense. As a rule stay away from downloading from Cnet.com, softsonic.com, download.com, drivers.com, softpedia.com, and try to download from the developers site if they offer it. These mass DL sites have become a hotbed of crapware distribution sites that act like that little bird that actually but garbage back into the alligators mouth and the other birds are like "knock it off Jerry!" - ok I have no analogy for this other than pay attention to the sites you obtain downloads from, always try to use the developers site, not a 3rd party.