Why is Google Play Services Force stop greyed out?

This morning I switched on my mobile phone, samsung galaxy mini S4 and two messages keep coming up that I have never seen before.

1.Unfortunately Google Play services stopped
2.Unfortunately the process com.google.process.gapps has stopped

Looking online one possible solution is:
Go to Settings > Apps.
Scroll to All apps and then scroll down to Google Play Services app.
Open the app details and tap on the Force stop button.
Then, tap on the Clear cache button.

When I go to Googple Play services Force stop button and Uninstall updates is greyed out. The only option is Disable. I have cleared the cache but it hasn't solved the problem.

What else can I try to solve the problem as some apps won't work with this message.

I have not made any changes on the phone nor I haven't done any updated ot installed new soft ware for a very long time so I don't know why I have suddenly got this problem. I lasted used one on the non working apps 2 days ago and everything was OK.

Thank you