When I try the to do apkd-install Google Play Store asks is I want to install an update to this build-in application. What should I do here? The options are Cancel and Install. Thanks!

EDIT: I'm not sure why but the Play Store actually is working in the sense that I can access the play store from my browser and it knows what apps I have on my tablet. Including those that I simply copied from another phone and installed on the tablet. So it seems that the only thing missing is the Play Store icon.

EDIT: Now the play store icon has mysteriously appeared! Go figure!