When trying to install WCF Data Services 5.0 prior to installing SharePoint 2013 setup failed with the error: "0x800b010a - a certificate chain could not be built to a trusted root authority".
My test server is in a disconnected environment. I looked up the error message and the resolution was available in the KB Article http://support.microsoft.com/kb/931125 . I downloaded the update package intended for Windows XP as a workaround and it worked out. Note that "It is recommended that systems running Windows client or server SKUs in disconnected environments (ex. where the automatic root update mechanism doesn’t work, since connectivity to Microsoft Update is not available) should install the root update package. The root update package will install on Windows Vista and Windows 7 as a workaround in disconnected environments, however it is not recommended that systems that have network connectivity to Microsoft Update install the root update package, since the automatic root update mechanism will work for them." See the support article for more information: http://support.microsoft.com/kb/931125