unable to login to admin

Hi all,
Bit long winded but I will give all the facts.
My website http://www.heatcentralgas.co.uk went down a week or so ago, it was showing a webfaction fault page, I have found out that the guy who made the page and was hosting it has gone awol, no anser to emails and phone is dead. So I currently have no host and need to join one ASAP, but I need to make sure I can move current website and email to new host (Not got a cluw what to do). Spoke to several people to no avail, domain is in my name after supplying details to 123-reg. Today the page has appeared again so I logged into it via /wp-admin page, I have done a back up to my computer, then I updated the word press and some plug ins, now it is showing this and I am unable to get back into the admin page.
I think it may be a plug in but am unable to log in to alter. Any help is much appreciated.

Warning: strpos(): Empty needle in /home/wsjmdavies/webapps/heatcentralgas_wp/wp-content/plugins/admin-menu-editor/includes/shadow_plugin_framework.php on line 325

Warning: Cannot modify header information – headers already sent by (output started at /home/wsjmdavies/webapps/heatcentralgas_wp/wp-content/plugins/admin-menu-editor/includes/shadow_plugin_framework.php:325) in /home/wsjmdavies/webapps/heatcentralgas_wp/wp-includes/pluggable.php on line 1219

The page I need help with: [log in to see the link]