4 x USB videograbbers and a USB webcam, going round in circles can't add all 5 at the same time

I've heard OBS is ok with adding this many USB sources, but I may just need PC help

I've got 4 videograbbers (whatever you call them) 3 of them are 'easycap' brand. but they all do the same sort of thing.
I bought recently a "d-link" usb hub hardware thingy t hat has 7 ports, hooks up to mains power too, and thought this would end all my troubles, it hasn't. I've been doing hours of battling with this PC to get all 5 things on at the same time, done everything from restarting the pc, removing ALL usb's. starting over and adding them in 1 by 1, removing sources, adding sources, activating and deactivating in OBS. tearing my hair out! why can't I just have all 5 running at once ,there must be a simple solution? or is USB technology THAT flakey that I can't do it.
 
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