here is the explanation for Code 38 in Device Manager:
Full Error Message
Windows cannot load the device driver for this hardware because a previous instance of the device driver is still in memory. (Code 38)
The driver could not be loaded because a previous instance is still loaded.
Restart your computer. From Start, click Shut Down, and then select Restart.
The Video Graphic Driver is not involved in recognizing your Monitor. It is your Monitor Driver that does that. You need to go to the Monitor's Manufacturer's Support site and see if they have a Monitor Driver for your Monitor.
You can download your Monitor's Driver from here directly from the AOC Support Website: AOC
You can uninstall the Monitor driver (make sure to uninstall from drive) from Device Manager and then reinstall the new Monitor driver from the Manufacturer's Support site.
Is it one of their revised/refreshed/renamed/upgraded models ?. Maybe check with aoc support ?