Forum pages are suddenly not showing

I recently had a problem with IIS completely disappearing from my server. My husband re-installed IIS and then a site that I host started having problems with its forum pages. I kept getting a 404 error even though the forum folder was there and everything was set up correctly. I took the forum down and upgraded to the newest version. I am still having the same problem. The file is there, the path is correct, I have stopped and started IIS, I have deleted everything and readded it. I am at a loss as to why this is happening. It works just fine on my laptop and PC in localhost, but when I upload to the live server, it can't find the folder. Please, please help me as I need to get the forum going again for my client. Oh and permissions are set correctly as well. This is a page not found error, not an .ASP error. The site is www.baneoftheaegis.com if you want to see the error.

You should be able to inspect the URL in the web browser that's giving the page not found error, and then use the IIS management console to verify the page really exists at the url you specify.

Perhaps you're relying on application or session variables in asp code and you didn't re-install IIS with the same web application structure as previously existed.