Win app setup file new version

Try this one, and u will never use anything else again.
basicly just import the thing and choose ini/xml/or reg in ur application i prefer ini, so i can have all my projects portable and just one dir with managed ini's

http://www.codeproject.com/KB/cs/readwritexmlini.aspx
And for the updates force an mutex singleapp that always checks for updates , and have a static addOn directory that always takes the compiled assemblys from that dir instead of the embeded ones.
this way you can always keep the old instalation and can always add or inprove by just one single dll file

something like

<br />
	private void LoadAddIns()	<br />
		{<br />
			DirectoryInfo addInDirInfo = new DirectoryInfo(Path.Combine(Application.StartupPath, "AddIns"));<br />
				if (addInDirInfo.Exists)<br />
				{<br />
				// Get all of the assemblies in the AddIns directory<br />
				foreach (FileInfo fileInfo in addInDirInfo.GetFiles("*.dll"))<br />
				{<br />
					// Load the assembly and iterate through all of the types in it.<br />
					Assembly assembly = Assembly.LoadFrom(fileInfo.FullName);<br />
					foreach (Type type in assembly.GetTypes())<br />
					{<br />
						// If the type <big>implements</big> , create an instance of it and add it to the program<br />
						if (type.GetInterface(mystuff) != null)<br />
						{<br />
							classProvider = (myclass)Activator.CreateInstance(type);<br />
							Program.Add(classProvider);<br />
							}<br />
					}<br />
				}<br />
			}<br />
		}<br />
<br />
</code>

And have this before all other code so you can always overrule an old assemby