Hackintosh takes forever to boot, only works after booting into windows?

Hey guys, this is probably a frequent question, but I haven't found any answers to my problem. Basically, my hackintosh boots for several minutes only to restart again. I suspect that it cannot load the nvidia webdrivers. When I boot into windows after pressing f12 to go into the bios (is there an easier way to boot into windows?) and restarting the hackintosh, it boots up directly.

Any help?

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Specs:

Dell Optiplex 990 MT

i7 2600

GTX 1050ti

16 GB RAM

SSD