Hi! When I tried to install 4 gigabytes of ram memory to my Vista computer the kX (3539) drivers did not work at all; they only produced digital distortion noise. The same case happened with 3 gigabytes installation. When the amount of memory was reduced to 2 gigabytes, the drivers started to work again. I tried to reinstall the drivers, and even Vista, multiple times. Does someone else have similar problems or is there any solutions? The memory modules are physically ok, they are not causing the problem. Thank you for your help!