ASP. NET error handling (1) From msdn

Visual Studio. NET cannot determine whether ASP. NET 1.1 runs on the Web server computer. This error may occur in several different situations. Check whether the following conditions exist:

Make sure that. NET Framework 1.1 is installed on the Web server computer. For more information, see Visual Studio. NET software requirements.
If ASP. net has been installed on the Web server computer but still encounters this error, it may be a configuration problem. To correct problematic installation or configuration, you can use the ASP. NET utility named aspnet_regiis. You can find this command line utility in a path similar to the following:
C: \ windows \ Microsoft. NET \ framework \ v1.1.nnnn \
NNNN indicates four internal versions. Search for the maximum version number. Use the/I switch to run the utility:

Aspnet_regiis/I
Prompt that you can open the command window directly from the correct directory of the command. From the "Start" menu in windows, point to"Program"," Visual Studio. NET 2003 "," Visual Studio. NET tool ", and then select" Visual Studio. NET command prompt ". After the window opens, type aspnet_regiis/I.
For information about the sequence that must be followed when installing components, see Visual Studio. NET failure to create an application <Application>. The required components are not installed.