no brother i am from India. about BT4 no i dint use. i dont have the guts to do so. i am not able to use backtrack 3 wat will i use BT4. i also have another problem. my BT3 also doesnt run on my Laptop (lenovo Y500). it seems as if the laptop has freezed but it actually hasn't.i can make out that my laptop is running by the timer and also when i switch on off the power the powermanager displays changes.