Check to see if you have the WXR.dll  file in  the FSX\Gauges folder. Looking at the image, I was expecting to see the radar screen black, not the actual radar (with the buttons) itself black.

gauge00=WXR!wr_display, 81,32,364,279 < The radar itself
gauge01=Captain_Sim.r001.P04!P04_radar, 0,0,525,386 < The radar screen

While the Captain_Sim.r001.P04 is a cab file, the WXR is a .dll file, and it's possible that the WXR.dll is missing, and if it is, it's probably been removed by your Anti Virus.