Hi Guys
after some days using an Arduino UNO and Windows Vista, the board stopped to upload the instructions.
First of all, I thought that I burned the FTDI circuit, because I had no answer of the TX/RX led when I tried to upload the program, however the LED 13 keep blinking...
Then I changed the USB cable... noting worked.
I fixed the problem deleting the Com Port on Windows device manager and creating it again.
It worked.
Good luck to all that have the same problem.
Thanks
Paulo Ranzani