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Install the ASP.NET Ajax 1.0 extensions here http://www.microsoft.com/downloads/details.aspx?FamilyID=ca9d90fa-e8c9-42e3-aa19-08e2c027f5d6&displaylang=en
Download this (AjaxControlToolkit.zip)
and unpack it to a folder on your local computer.
Open Visual Studio, right click on Tools and create a new tab. Call it Ajax Controls.
Right click the tab and pick Choose Items…
Browse to the directory where you unpacked the toolkit, browse to the Sample Web Site
folder, [...]