First do a manual update of WordPress core files using an FTP client such as FileZilla or your host provided file management tool(s). This requires you delete the two folders wp-admin and wp-includesonly and upload unedited fresh ones from a current download of WP3.5.2. Test site.
If not: rename the plugins folder in wp-content to old-plugins. Test Site.
If not: rename all theme folders in wp-content/themes to old-theme_folder_name and upload an unedited default theme. Test site.
Each step will tell you where the issue likely is.
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