actually i have just received a reply:
Regarding your concern, can you access windows before? Do you see the issue suddecly?
Please clear CMOs referring to the manual, enter BIOS, press F6 to load optimized defaults, check the system drive detected under BIOS->Settings->System Status, press F10 to save and reset to re-install a clean Windows to test again.
There is no need to load driver if you don't use RAID for your system. Thank you!