Related threads in Windows Update newsgroup:
http://groups.google.com/group/microsoft.public.windowsupdate/search?q=80070490+OR+0x80070490&start=0&scoring=d&Also see:
http://groups.google.com/group/microsoft.public.windows.vista.general/browse_frm/thread/e10734a4e83c81b====================================
Description of the System Update Readiness Tool for Windows Vista... (Tip: Download/Install manually if it's not already been installed)
http://support.microsoft.com/kb/947821You receive a "0x80070490" error code when you use Windows Update or Microsoft Update Web sites to install updates http://support.microsoft.com/kb/958044=======================
Free unlimited installation and compatibility support is available for Windows Vista, but only for Service Pack 2 (SP2). This support for Windows Vista Service Pack 2 (SP2) is valid until November 26, 2009. Go to
http://support.microsoft.com/oas/default.aspx?prid=13014&gprid=582034 & select appropriate category (e.g., Installation).
You'll find additional support for Vista SP2 issues in microsoft.public.windows.vista.general newsgroup and in these forums: