<%
Dim myFSO
'this line creates an instance of the File Scripting Object named myFSO
SET myFSO = Server.CreateObject("Scripting.FileSystemObject")
'error handling here to make sure that things go smoothly
'if the file does not exist 
If myFSO.FileExists("C:\Inetpub\wwwroot\myNewFolder\myNewText.txt") Then
'then we delete it
myFSO.DeleteFile("C:\Inetpub\wwwroot\myNewFolder\myNewText.txt")
Else
'otherwise we tell the client it does so they don't get a nasty error
Response.Write "THIS FILE DOESN'T EXISTS"
End If
'this line destroys the instance of the File Scripting Object named myFSO
SET myFSO = NOTHING
%>

To write to the file look at this tutorial.
To create a file look at this tutorial.
To create a folder in the same way look at this tutorial.
To delete a folder look at this tutorial.