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Installer Error for 2011.1

When trying to install NetAdvantage Ultimate 2011.1, I'm getting errors.  The log indicates a proxy authentication issue.  My IT staff has provided me with the proxy information that I would need, but I don't know how to give it to the installer.

I get this error even if I uncheck the 'download service pack' checkbox.

Installer Log content here:
12:17:49: Log file initialized
12:17:50: Local installer C:\ProgramData\Infragistics\NetAdvantage_WPF_20111.msi will be used.
12:17:50: Local installer C:\ProgramData\Infragistics\NetAdvantage_WPF_20111_Samples.msi will be used.
12:17:50: Local installer C:\ProgramData\Infragistics\NetAdvantage_VersionUtility_20111.msi will be used.
12:17:51: System.Net.WebException: The remote server returned an error: (407) Proxy Authentication Required.
   at System.Net.HttpWebRequest.GetResponse()
   at System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri, ICredentials credentials)
   at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials)
   at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
   at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings, XmlParserContext inputContext)
   at System.Xml.XmlReader.Create(String inputUri)
   at Infragistics.Wrapper.Interface.Utilities.AutoUpdatesUtility.DeSerialize[T](String sourceFile)
   at Infragistics.Wrapper.Interface.Utilities.AutoUpdatesUtility.UpdateRTMDownloadUrls()
12:17:53: serialnum matches expression:
12:17:53: Acceptable prefix found. Will validate the key


What do I do to resolve this issue and intall 2011.1?