Hello Erel.
I made some test with another laptop.
The problem wasn't the laptop, the problem was I made the connection from de Arduino Uno to the Bluetooth shield using the pins 0 and 1. When I remove that connection, both computers can transfer the program without problem; with the connection, the program can´t be transfer and run to the Arduino Uno.
I will try connecting the shield to pins 10 and 11, for example. Maybe the shield is the real problem.
Thanks a lot.