First, install an alternate launcher (Nova's probably easiest to deal with) - if you can't open Google Play normally, swipe up from the Home button to get to Google Now. With any luck, Google Search hasn't updated on you and you'll be able to open Google Play via a card.
Then clear the cache. (an option you get when, from a powered-down state, you hold the volume up and power button down 'til the LED flashes blue, then release. Choose the appropriate option, then reboot)
That'll stop the crashing, for the most part, speed up your Arc a fair bit, and is generally easier than trying to get into Settings while Tapestries is in an insta-crash loop (swiping down from the top and hitting the Settings icon) and doing a factory reset (Settings -> Backup & reset -> Factory data reset).
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