Hey, im having same kind of problem now and that re-installing you suggested did not work.. I have too GC-WB300D, (GA-Z87P-D3 ATX motherboard, Windows 7 64-bit) I can open my Wifi-share manager, but it is allways "disconnected". And when i try to make it "hotspot", my Wi-Fi Share says: "Wi-Fi Share SoftAP could not be started!". There is also nothing in Network connections but my own ethernet. I have no idea what to do, spent hours googling and loosing my mind whit this, all drivers are new and card is installed correctly.. (My wifi share manager is newest v.1.0.5.2). Any help would be so great!