regarding error "Http error-404 object not found"

[ashluvcadbury]

Hi all
I have visual studio 2003 and also configured IIS.But not able to
execute any web application.
I am a beginner and all the small web applications I had made some
days days ago were working perfectly .But now when i tried to execute
them again ,they are giving the error"Http error-404 object not
found" .what should I do.Please help me out.

thanks and regards