How to stop the pop up on my phone that says 'Google play services have stopped' on my galaxy s5?

[AC Question]

Basically this has gone on for a while and I don't know how to stop it I have reported it a lot of times and never seen to get answers back. I can't download this app again because my Google play store doesn't work as when I press on it, it says 'checking info' it's has done this for a while now and the pip up about play services comes up a lot whilst play store is checking info?! How can I sort this our because I really need my play store and services to be up and running. Thank you.