Hello s2020yo,
Welcome to Microsoft Community and we regret the inconvenience caused to you.
Do you remember what happened before this problem occurred? For example, hard drive freezes or BSOD and crash?
If your AK1 Acepc can only enter the BIOS interface. You can try pressing and holding the DEL key to enter the BIOS interface. Then, switch to the "BOOT" tab and check whether the first startup item of "Boot Option" is "windows boot manager". If not, it means that the system files are missing or the system is missing. And if you can’t enter Windows in safe mode then you need to reinstall Windows.
I would also recommend that you seek out the OEM(Acepc) to further check whether this issue also comes from the hardware. Thanks for your patience and have a great day!
Best Regards,
Lenka | Microsoft Community Support Specialist