Warning error 941

I upgraded the software last night it was ok But I came in Morning and Iam keeping getting massage erro 941 Security devive missing. I unplug the USB dongle and plug t back. I seen on corner New hardware found But WHEN I try install I am keep getting massege Hardware can not install error during the instaltaion. But in the second time Whem I open software I did'nt see massege error 941. When I look at device mager under hardware I seen USB RANBO SUPERPRO has yellow mark. I need help step by step