I think the File.delete from the system object is a slightly more effective delete than the Kill command (at least I have had more luck with it). Here is a good resource for the FileSystem object :
Below is an example on using Dir
' Display the names in C:\ that represent directories.
MyPath = "c:\" ' Set the path.
MyName = Dir(MyPath, vbDirectory) ' Retrieve the first entry.
Do While MyName <> "" ' Start the loop.
' Ignore the current directory and the encompassing directory.
If MyName <> "." And MyName <> ".." Then
' Use bitwise comparison to make sure MyName is a directory.
If (GetAttr(MyPath & MyName) And vbDirectory) = vbDirectory Then
Debug.Print MyName ' Display entry only if it
End If ' it represents a directory.
MyName = Dir ' Get next entry.