google nexus 4, keyboard + google play wont work?

so ive had my google nexus 4 for just under a month now and not long ago, i accidentally downloaded an app that i didnt want to download, so i held it down and clicked 'force stop'.

then whenever i went on google play, it instantly crashed, so i thought, no big deal i can download apps via my laptop. that didnt work either and suddenly my keyboard wont appear whenever i need to type something.

also, notifications keep popping up telling me that my keyboard has stopped working and also that my google play has stopped working.

apart from this, there are no problems with the phone

any reliable help would be greatly appreciated.

thanks