Paloy,
First I need for you to please run the MGA Diagnostic Tool and provide us with the results. Follow the directions located @ http://forums.microsoft.com/Genuine/ShowPost.aspx?PostID=2170194&SiteID=25 . Also tell me about your computer. Is this computer a commercial or custom built system? Was the computer ever turned into a business for repairs or maybe a friend made repairs for you? It is important to provide us with as much information as you can.
Thank you and we will await the Diag results.
Stephen Holm, MS
WGA Forum Manager