IIS automatically changes running framework version

[Diego Serrano]

I have a Windows 2003 server with a couble of websites in IIS. Every
website and virtual directory are set to run .net framework v1.1. The
most used of those websites is developed for v1.1 but after some days
running rigth, iis suddenly starts running it under v2.0. Although
there is not a single virtual directory trying to run v2.0, IIS does
want it. I've created an app. pool and add the problematic website
inside it, but the issue continues.
I've finally prohibited asp.net v2.0 in "web service extensions" and I
really hope IIS would understand me.
But I don't think it's a good workaround.
Do you have any suggestion?

Thanks in advance.

 

[Diego Serrano]

I forgot this:

aspnet_regiis.exe -lk says that everything is running v1.1