Thank you for this help. Now I've installed XP on my Dell-1720.
Some people told me - "You have trouble!"
Some times i clicked button "OK"... And just... All was easy.
So, now i can continue my work and create music again...
(Big problem in VISTA : ASIO driver of my audio device (Lexicon) cannot to function in a normal mode)
also VISTA have many bugs and inconveniences (my opinion about Vista).
While i use XP - i cannot have more problems...