Headphone trouble with Cross DJ 1.2.9 Please Help!

Hi
Ok I just got an Ion discover DJ with Cross DJ 1.2.9.
Its working great except i can't use my headphones to monitor.
Im new to this so i dont understand much about soundcards and drivers but i did get ASIO4ALL working which i think i need from looking at other threads.
The problem is that the sound comes from both the speakers and the headphones even when i have pressed monitor, and sometimes pressing it makes the speakers louder for some reason.
My computer has 6 audio ports in the back (All differnet Colours) 1 of which connects my speakers. I have tried putting my headphones in all of these as well as the headphones port on the front but no luck. I have also tried all the differnt routing modes.
Could it be because i haven't installed U46MK2 v1.041 (whatever that is)? I have tired but it wouldnt install.
Thanks anybody who tries to help
Ok I just got an Ion discover DJ with Cross DJ 1.2.9.
Its working great except i can't use my headphones to monitor.
Im new to this so i dont understand much about soundcards and drivers but i did get ASIO4ALL working which i think i need from looking at other threads.
The problem is that the sound comes from both the speakers and the headphones even when i have pressed monitor, and sometimes pressing it makes the speakers louder for some reason.
My computer has 6 audio ports in the back (All differnet Colours) 1 of which connects my speakers. I have tried putting my headphones in all of these as well as the headphones port on the front but no luck. I have also tried all the differnt routing modes.
Could it be because i haven't installed U46MK2 v1.041 (whatever that is)? I have tired but it wouldnt install.
Thanks anybody who tries to help