Can't "enable" FB app on my rezound.

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http://forums.androidcentral.com – I disabled the app, didn't want it, several months ago. Now I want to enable it but each time (no matter HOW I get to it) as soon as I click the "enable" button, Google Play closes. I've rebooted the phone etc... I app was disabled before the last software update on the phone, maybe this is affecting it? Any hints? Any way to actually "remove" the app from the "my apps" list? (I haven't found any way to do that yet). Then I can try to reinstall it... ? (HowTos)