.NET framework warnings

How do you resolve errors like this?  I download a project off the web.  When I try to run it, I get between 11 and 13 warning messages like the one below.

Warning      1      The following assembly has dependencies on a version of the .NET Framework that is higher than the target and might not load correctly during runtime causing a failure: DotNetOpenAuth.AspNet, Version=4.0.0.0, Culture=neutral, PublicKeyToken=2780ccd10d57b246. The dependencies are: mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; System.Xml.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a; System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089. You should either ensure that the dependent assembly is correct for the target framework, or ensure that the target framework you are addressing is that of the dependent assembly.
rrhandle8Asked:
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RizzleCommented:
What version of dotnet do you have installed?
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Éric MoreauSenior .Net ConsultantCommented:
it looks like your project is targeting an older version of the .Net Framework than the libraries it is referencing. Open the properties of the project, and make it is targeting at least version 4.
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