Thank you for the reply.
Please reset the BIOS to default. Restart the computer and the moment it starts start tapping the F2 key to boot the computer to BIOS.
Select Load Default > Apply > Exit.
Reinstall the operating system. Delete all the partitions during the installation. Once the partitions are deleted you will see a single option "Unallocated Space". Create a new partion from unallocated Space and install windows.
Hope it helps.
Thanks & Regards