keyboard & Display problem in Lenovo Yoga 2

Hi,

I've just got a new Lenova Yoga 2 tablet. It's done a few OS updates to finally get to Android 5.0.1.
When I start Google Chrome no keyboard is displayed to allow me to type anything in. If I go into the Settings and look at Language & Input, it tells me that "com.android.settings" has stopped. Trying to run up Play Store does nothing. If I try to run GMail, it tells me that I need to enable Google Play services. I select the Enable Google Play Services and then it just crashes. Obviously not having a keyboard stops me getting onto the internet to download a version of it. I don't know what version I need that is compatible with this Android version.
I know it is possible to connect my PC to the tablet and transfer data between the two.
I've been hunting the web all day for a solution and everything points to me needing Google Play Services, but I don't know what version and how to install it back onto the tablet.