Now I reinstall a clean version on my laptop. I will come back with the results. Thx for your help. L.E. Unfortunatelly, it seems that I am not gonna succed that operation. I just finished installing a clean version of 7 on my laptop and i get the same error. I don't know why. I did it exactelly as you descrived, an unmodifyed OS, WAIK 7 from Microsoft site, downloaded the last version of 7 from a tracker, BiE version from February and after all that "trouble"... as I said... it's not working, i get the same error. I give up. I just wanted to make an updated version of my personal modifyed OS, but at the end, i will update it and this is it. But anyway, thank you very much for your time and your kindness in trying to help me. Regards, Adadu