2 computers unable to connect to the WiFi, seem to be competing for the same ip address

[Windows 10]

Me and my brothers PC's had been working on the WiFi perfectly fine a few weeks ago until they both started having the issue at the same time. A cable each is connected to the back of the router being in slot 1 and 2.I've tried all the suggestions I could find:Resetting WiFi router - only works temporarily sometimes not at allGoing through command prompt, doing the 'ipconfig' and 'netsh' commands and only getting the error 'DHCP client has already been assigned or in use' something along the lines of thatI'm really struggling to find a solution as I've been getting frustrated over it, any help

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