PHP error prevents POSTING etc

Hi
When posting I don’t have the options for ‘visual’ and ‘html’ anymore, neither insert link etc, also I can’t add tags…
IE gives me this error:

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Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Thu, 31 Dec 2009 07:49:28 UTC

Message: Invalid character
Line: 12
Char: 293
Code: 0
URI: http://www.boxlife.co.za/wp-admin/load-scripts.php?c=0&load=jquery,utils,quicktags&ver=b64ae9a301a545332f1fcd4c6c5351b4

Message: Object expected
Line: 393
Char: 1
Code: 0
URI: http://www.boxlife.co.za/wp-admin/post.php?action=edit&post=109

Message: Invalid character
Line: 1
Char: 300
Code: 0
URI: http://www.boxlife.co.za/wp-admin/load-scripts.php?c=0&load=hoverIntent,common,jquery-color,suggest,wp-ajax-response,wp-lists,jquery-ui-core,jquery-ui-sortable,postbox,post,thickbox,media-upload,word-count,jquery-ui-resizable,admin-comments,schedule,autosave&ver=662a8ecdca690d4ffc7aca7c779fe12e

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Kindly help!
God bless
Gabriël