Hi there dlove,
You can uninstall the device in Device Manager -> unplug it -> reboot -> plug the flash drive back and wait to automatically install.
If this doesn't work, try it on anther system. This way you will kind of narrow the possibilities of what is causing the problem(system or flash drive itself).
It may be a good idea to update all your drivers as George Mulligan already suggested.
Hope this will help,
D_Know_WD