This device could perform faster message

Hello,
I keep receiving a pop-up with the above message concerning my USB ports..when nothing is connected. From reading around I suspect the problem may be a stray driver from some software package but how do I detect which? I can see at least one in Device Manager relating to a programme I've deleted in the past. Another is for Virtual WiFi (I had difficulties with the MiniPort Adapter at one stage) but I gather that will be coming into use at some point? Bit of a novice, can someone reassure me how to detect the problem and fix it? Thanx