IIS problem in Windows 2000

I don't know what's going on. I've upgraded to windows 2000 professional, installed IIS and my asp files won't run. I get HTTP 500 - Internal Server Error. I have the web sharing on the folders and I can see html files fine and again no ASP. Can anyone please give me some guidance?

Thanks in advance,

I can't even get the online IIS help working.

Please help.

Make sure your frontpage extensions are installed. Try uninstalling them and re-installing them.

I've had a similar problem once before...