<%
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 NOT myFSO.FileExists("C:\Inetpub\wwwroot\myNewFolder\myNewText.txt") Then
'then we create it on this drive in the path we specify
myFSO.CreateTextFile("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 ALREADY EXISTS"
End If
'this line destroys the instance of the File Scripting Object named myFSO
SET myFSO = NOTHING
%>

Now you can do this with ease. Just make sure you have write permissions to the server in the directory you want to create the file in.

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