I have been using various Arduinos for a while. Some time ago I noticed that if I plugged an Arduino directly to the computer I got a USB device not found error, However, if I plugged the same Arduino in through a USB hub, usually on my monitor, it worked fine. So I have been using the hub.
Today I plugged an Arduino in to the computer directly and it crashed it, BSOD + loud buzzy noise. Restarted and tried again, sure enough another BSOD. Then I tried a FDTI adaptor (not connected to anything), BSOD.
I'm using windows 7. The USB ports seem to work fine with other accessories. Any idea what might be causing the computer to crash?