ASP.NET 2.0 Applications not working

After installing my Win2003 server (x64) I couldn't make ASP.NET 2.0 application to work. Usually I would check the ASP.NET tab in the IIS MMC, but that tab wouldn't appear (if it does appear verify that the correct ASP.NET version is assign to the application & in the "Virtual Directory" tab, there and "Application Settings" with execute permission - "Scripts" at least)

The solution on the web didn't work:
Microsoft comments: If a previous version was not uninstalled correctly, please regedit eliminate all versions except 2.0.0.0 in the following locations:
HKET_CLASSES_ROOT\CLSID\{7D23CCC6-A390-406E-AB67-2F8B7558F6F6}\InprocServer32\
HKET_CLASSES_ROOT\CLSID\{FD5CD8B1-6FE0-44F3-BBFB-65E3655B096E} \InprocServer32\
HKEY_CLASSES_ROOT\CLSID\{FEDB2179-2335-48F0-AA28-5CDA35A2B36D}\InprocServer32\

Also re-installing .NET Framework 2.0 didn't work, nor registering ASP.NET:
%SYSTEM%\Framework64\2.0.XXX\aspnet_regiis -i

Finally I found a solution (not to the MMC yet): use a separate application pool. After creating a separate application pool for the ASP.NET 2.0 applications everything worked just fine.