You said, when you check device manager, there is a yellow exclamation! That means there is a conflict. Have you checked the properties window for both devices from device manager?
May be you need to uninstall drivers for both and reinstall the drivers but you say you also did that. Did you check for driver uptades?
That's strange because devices were working properly and they stopped working all of a sudden. How old are the devices? What changes have you made lately that could cause a problem like this? Any software installations, any other device installation? Configuration, setting changes? etc.