Not Updating Vista System

[specialgoods]

Brand new vista system with eq/vent many programs installed and running well. Get this error:
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.DtdParserProxy.System.Xml.IDtdParserAdapter.Throw(E xception e)
at System.Xml.DtdParser.Throw(Int32 curPos, String res, String arg)
at System.Xml.DtdParser.ScanSubsetContent()
at System.Xml.DtdParser.GetToken(Boolean needWhiteSpace)
at System.Xml.DtdParser.ParseSubset()
at System.Xml.DtdParser.ParseExternalSubset()
at System.Xml.DtdParser.ParseInDocumentDtd(Boolean saveInternalSubset)
at System.Xml.DtdParser.Parse(Boolean saveInternalSubset)
at System.Xml.XmlTextReaderImpl.ParseDoctypeDecl()
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlTextReader.Read()
at System.Xml.XmlReader.MoveToContent()
at System.Data.DataSet.ReadXml(XmlReader reader, Boolean denyResolving)
at System.Data.DataSet.ReadXml(String fileName)
at WindowsApplication7.Form1.DownloadExtras()Expected DTD markup was not found. Line 3, position 3.

Gimme some help!