(specifically the "Boot" or "USB Downloader" tool) is primarily used for flashing firmware or recovering digital satellite receivers (STBs) that use the NationalChip GX6605S chipset. It is not a standard tool for booting or installing the Windows 10 operating system itself.
To avoid this problem in the future, always verify the integrity of your GXDownloader installer, create a restore point beforehand, and consider switching to a boot-safe download manager if conflicts persist. gxdownloader boot windows 10