That´s it !!I uninstalled every bit of sony product (vegas pro, dvd architect 4.5 , sound forge 8, some sony loops, some third part plug-ins for vegas…), cleaned the registry and started installing everything again (first one vegas pro !). NOW it works as it should !!!!! Don´t know why though… BUT, I´m fine now. Thanks for your time, and sorry I can´t enlighten anyone else in this matter, except advicing to uninstall ALL sony products ( cause I tried uninstalling only vegas and didn´t work !). Thanks guys 🙂