Fatal Error - Can no longer acces site through wp-admin.

MAJOR ISSUE:

I went in and deactivated all plugins as suggested. I can no loner access RADMediaWorks.com/wp-admin.

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 77824 bytes) in /home/content/90/10527590/html/wp-admin/includes/template.php on line 631

RADMediaWorks.com/orlando/wp-admin

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 47 bytes) in /home/content/90/10527590/html/wp-includes/cache.php on line 570

I have now lost access to everything.

Need assistance asap - please.