Somehow my ASPNET_WP.EXE couldn't start anymore. The two error messages 
related to this from the event viewer were:
 
Event Source:	ASP.NET 1.0.3705.0
aspnet_wp.exe could not be started. HRESULT for the failure: 80004005

Event Source:	ASP.NET 1.0.3705.0
aspnet_wp.exe could not be launched because the username and/or password 
supplied in the processModel section of the config file are invalid.


I suspect the reason might be my incidental change of the ASPNET account 
password in my WindowsXP. Afterwared,  I went to the Machine.Config file 
and changed the <ProcessModel's user to system (the original one was 
machine). It still didn't work. Could anyone tell me what would be the 
likely reason and how to fix it other than reinstalling my .NET framework?

Many thanks,

Frank