Greetings!! Recently I got a MacBook Pro 9,1 (15 inches, i7, mid-2012 etc...you can check specs online too). Now the problem is I have a Realtek 8187L USB wifi adapter and by the time I connect it to the MacBook...nothing happens...the wifi adapter is 802.11 b/g and the laptop supports 801.11a/b/g/n...I haven't been able either to obtain drivers...I'm pretty much new to Mac software and I would like to know something more about this situation. By the way...if the OS is necessary I have installed the OS X El Capitan version 10.11.3. I would be grateful if I could get some answers to my problem.