The most common cause is the use of FTP in uploading FrontPage generated webpages. This can damage the FrontPage extensions. In this case the FrontPage extensions will need to be reinstalled. This can be done in your cPanel Control Panel. If you are utilizing FrontPage to create your site, you MUST use the file upload feature in the FrontPage program to deliver these pages to the web server. If FrontPage webpages are transferred by another FTP client, FrontPage extensions will become damaged. And even though the pages may be successfully uploaded, they will not be viewable (translatable by a web browser) due to corrupted code.