Guys, I have an issue with the Webcontrols not working.

I have both DNN 4.5.1 and 3.3.7 running well. No immediate issues, however...


When I open one of my modules that uses the DnnTree, it shows a "placeholder" with and Unknown Server tag err.

When I delete that "place holder" and drop the Dnntree into the module from the toolbox, I get the following msgBox:
"control cannot be created because visual studio cannot find the control's type in the control assembly"

Another Example: I've downloaded and installed the HELP module.
When I open the source of the Help.ascx file, the following line shows an err:
<%@ Control Language="vb" AutoEventWireup="false" Inherits="DotNetNuke.Modules.Help.Help" Codebehind="Help.ascx.vb" %>
The error is: "C:\DNN451_Source\Website\DesktopModules\Help\Help.ascx: ASP.Net runtime error: could not find part of the path C:\Inetpub\wwwroot\DotNetNukeHelp441"

This is also related to WebControls as I have a similar error in this line in MY errant module:
<%@ Register TagPrefix="DNN" Namespace="DotNetNuke.UI.WebControls" Assembly="DotNetNuke.WebControls" %>


ANY advice?
Should I use the Treeview that is now in Visual Studio? I can easlily swap 'em out and amend the module.
However, I do eventually want to use and maybe extend the HELP module but cannot unless I get Webcontrols to work.

I've re-installed the Webcontrols umpteen times and re-references said controls again and again.

Some setting is wrong, I'm sure ... a path somewhere ... an errant entry ... just cannot see it.

PLEASE HELP!!

thanks