ASP.NET Not Working - XML Parsing Error: not well-formed

God bless this guy:

http://theshiva.us/technicalblog/archive/2007/03/26/fix-for-asp-net-xml-parsing-error-not-well-formed-line-number-1-column-2.aspx

He gives a no bs explanation of what to do if when you set up an ASP.NET web application on a server you see this:

XML Parsing Error: not well-formed etc....

ASP.NET 2.0 Framework

%Windir%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe -i

ASP.NET 1.1 Framework

%Windir%\Microsoft.NET\Framework\v1.1.4322\aspnet_regiis.exe -i