Flash Drive Problem Very Slow Computer

My computer was fine the previous evening, but the next morning it was massively slow and would freeze up before the website would even come on. The name of the website would show up, but nothing else. The mouse arrow just went in a constant circle. When I clicked on 'devices and printers' there was a yellow triangle with exclamation mark on 'Cruzer' and on 'Rhonda-PC'. A friend suggested I try removing the flash drive to see if computer was ok after it was removed. After I removed it computer went back to normal...no slowness or freezing up anymore. My question is 'Why is there still a yellow triangle with exclamation mark on the 'Rhonda-PC' symbol ? Its an HP with Windows 7 and Internet Explorer version 11.

Thanks

 

I have a flash drive that does the same thing when i plugged it into a normal usb port.

But when i got my self a Expansion usb port that has four more ports added it ran fine.