Is it many pages? Currently, the best method would be to use UltimateWB website builder to create your website again, from scratch, but you could copy/paste content from your current website to the new UltimateWB program. You could either save your content on a Word program, for example, or temporarily upload the UltimateWB website builder to another subfolder, and then move it to your root/where you want your website when you are done. Or, if you still have access to Frontpage software and have your files available offline, you could just copy your content from there and paste to your content pages using the UltimateWB software.