I have two computers both quad core, one running vista and the other win7. I had problems with the RTL8187L chipset in win7 but now realtek have bought out drivers for win7. My adaptors are 1. Alfa 036h 1000w with a 7db panel antenna. 2. Wifisky 980WG 5800w. 7db panel antenna. both use the realtek RTL8187L chipset which i find is the easiest to work with. I had used to use an edup adaptor with the newer trl3070 chipset but half the time could not get it to work. I havent really experimented with the wifisky yet as i only bought it a few weeks ago, but i did try it out briefly and it certainly has the power ! It was also very cheap at around $20 from China. I am waiting until i can get a really hi db antenna before i play about with it. Fortuneately i live on top of a hill and have no obstruction that would block any signal.