Strange Appearance of Admin Page/No Access

Hello everyone!
I am in desperate need for help. I upgraded some plugins and now when I sign into my admin all I see is:

Warning: session_start() [function.session-start]: The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and ‘-,’ in /home/content/67/10676467/html/wp-content/plugins/wordpress-social-login/wp-social-login.php on line 63

Warning: session_start() [function.session-start]: Cannot send session cookie – headers already sent by (output started at /home/content/67/10676467/html/wp-content/plugins/wordpress-social-login/wp-social-login.php:63) in /home/content/67/10676467/html/wp-content/plugins/wordpress-social-login/wp-social-login.php on line 63

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/content/67/10676467/html/wp-content/plugins/wordpress-social-login/wp-social-login.php:63) in /home/content/67/10676467/html/wp-content/plugins/wordpress-social-login/wp-social-login.php on line 63

Warning: Cannot modify header information – headers already sent by (output started at /home/content/67/10676467/html/wp-content/plugins/wordpress-social-login/wp-social-login.php:63) in /home/content/67/10676467/html/wp-includes/pluggable.php on line 1196

PLEASE HELP!!!!!!!!