Can't install Windows 10 on Samsung 850 EVO (250GB) SSD in Asus K75VM

From description I think there's some compatibility issue here.

1. Make sure you have the latest BIOS version on the laptop. Support lists v. 234 as the latest for windows 8.
2. It shouldn't matter which slot SSD is in, but if Asus says it should be in primary bay then that's where it should be.
3. Windows works best with UEFI. Unfortunately, I've seen fair share of laptops where it got corrupted. It might be a repair job if update won't fix things.
4. Make sure that SATA Operation mode is on AHCI.