IIS serves all ASPX and HTMLs but not ASPs

I am having a problem with:
Windows 2000 Professional IIS with dot net loaded.
The weirder thing is it once worked.
The main problem is that dot net and html always worked and originally so was asp.
All of a sudden ASP stopped working, after much frustration I unloaded IIS and reinstalled it.
I also did the following:
1) disabled Norton anti virus ( and script blocking)
2) reran aspnet_regiis -i (which reported OK)
3) made sure default location of site in IIS is (C:\Inetpub\wwwroot)
4) made sure machine.config had correct user and password in processmode attribute
5) made sure that asp.dll is mapped correctly when checking home directory configuration for asp.

I can develop in Visual Studio. Net, I can load html or aspx pages using the browser, but when I either add a simple asp page to the dotnet project or
to the default location and point to it (using localhost) with the ie browser it just clocks away - doesn't report an error nor does it load!!!!
what else can I do?
Thanks

Well, your symptoms sure sound like some script blocking or firewall that's interfering with asp code.

I checked the log file and saw a message like

The HTTP server encountered an unhandled exception while processing the sapi Application 'IISRTL! ALLOC_CACHE_HANDLER

Microsoft Knowledge Base Article - 257547
said give read permissions to the IWAM account, after playing around with it and the IUSR account - it started working.
I have no idea how it lost permissions but at least for now I am productive

I'm glad you got it sorted out.