Cannot Access WP Admin Section

Hi there,

I’m hoping someone can help me. I run a website for someone that doesn’t require many updates. As a result, I haven’t logged into the admin section for quite some time. I did today and was alerted to the new version of WP (3.1) and was asked if I would like to upgrade. I clicked yes and since then, I’ve been having a slight issue.

The website in question is http://www.four-counties.co.uk

For a while the website was down, with a splash screen saying it was under scheduled maintenance. The website has since reappeared, but I can no longer log into the back end at http://www.four-counties.co.uk/wp-admin/

I receive the following error:

Fatal error: Cannot redeclare tinymce_include() (previously declared in E:\domains\f\four-counties.co.uk\user\htdocs\wp-includes\deprecated.php:756) in E:\domains\f\four-counties.co.uk\user\htdocs\wp-admin\includes\deprecated.php on line 25

Is anyone able to assist in helping me to log in?

Many thanks

Simon