Is this he first time that you received that problem/error?
some sites have security/authorization/ certification before you can sign in..
***This error occurs when the client does not know about the certificate authority that issued the server certificate. The problem may be corrected by installing the certificate authority's root certificate. A list of all installed certificates can be viewed from Internet Explorer. From the View menu, click Internet Options, click the Content tab, and click Authorities.
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invalid codes are not common but they do exist you will need to contact roxio inc at www.roxio.com tell them the problem supply the error install id number and they said they would be happy to supply you with a new code
Could it be you have Roxio installed try this fix and you have a dell pc? http://support.dell.com/support/topics/global.aspx/support/dsn/document?c=us&l=en&s=gen&docid=3A96B19567D8D335E040A68F5B287394&journalid=702EA37FA341FDF4E040AE0AB8E16F1E&Query=&SystemID=&ServiceTag=&contenttype=&os=&component=&lang=&doclang=&toggle=&dl=
If your copy of Vista is on a DVD (rather than preinstalled) some people have had success installing the DVD disc and choosing Upgrade (NOT Install...that will WIPE your existing system!) Somehow the Upgrade process corrects the corruption that creates your problem BUT plan on a long siege...it's NOT an immediate process. See:http://www.vistaheads.com/forums/microsoft-public-windowsupdate/180888-re-error-code-80070490-a.html and good luck!
If your copy is pre-installed, my best suggestion is to call the manufacturer of your PC, HP or Dell or Gateway Support and drive THEM nuts with it...Microsoft isn't too great at fixing it either, from reports I've read.