Driver Help

I bought a dell optiplex 790 and added a r7 260x and a 500 watt evga psu . My pc keeps restarting due to a device driver stuck in thread. I think I isolated it to the pci serial port but dell does not offer an official driver for it because they dont support 790's on windows 10 so right now i have no driver for it what should I do.
Also all my drivers beside the serial port one are up to date and i am 100% positive its not a hardware problem. are there drivers i can use to replace it or will i need a new motherboards.

I'd find out what components your computer has, then get each driver separately

W10 is not that great, I'd get the latest supported OS

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