Thank you, however I already tried that, and it did not work. Apparently, according to the technical service from Dell, it is an operating system issue. I was suggested to either repair the installation (a very tedious process, which I do not want to do), or reinstall Windows x64. I can do the second one, however, before trying that, I would try something else, if there is anything else to be tried. I do not know if the reinstallation would work, and because it is a long process, I would use it as a last resort. Bogdan