sethcshort on "[Plugin: W3 Total Cache] Upgraded plugin, now 500 error for public and admin"

Help!

I upgraded our W3 Total Cache plugin, and it never finished the upgrade. Now I get a 500 error and can't get in to admin the WP site. It's also a 500 error for the public. I need to fix this ASAP!

Thanks,
Seth

http://wordpress.org/extend/plugins/w3-total-cache/