Hi, I am new hier..my english is not very good!

I have vag-k-can cable (black) from china. but it don`t work!
The message is Target not responding.
My com-settings are com4.
I used Windows xp service pack 3
vag- can commander 1.4,2.1,3.0,4.5,5.0 but nothing work

My cars: Golf 4 V6 4-Motion 2001
A4 Avant 1,8t 2003

Can you help me