Thanks Alaban !!! I just found out 5 minutes ago the culprit. The 2 people who had this issue installed a program called Duet Display which lets you use your ipad as a 2nd monitor. Once we uninstalled Duet Display, the exclamation point disappeared from the video driver and all the display link drivers showed up as unknown devices in device manager. All I had to do at this point was re-install the display link drivers and everything started working again.
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