I have forgotten to post that I have formated mi HD several times, I it hasn´t worked anyway. Well, I think I have tried all what is on http://www.theavonlady.org/theofpfaq/trouble/checksum.htm , even BIOS, chipset, HD Controller, nVIDIA driver, I have VIA 4-in-1 last driver, I have tried to install a HD driver which VIA recomend to install apart of the VIA 4-in-1, but this doesn´t work.