After installing Debian, I see two boot options when I enter the BIOS. Also, I would like to mention that somebody has been hacking me for few months. I have formatted HDD but without results. Maybe the problem is in the EFI/BIOS?
Try to make flash drive bootable using the following link.
May be it will help to solve your problem.
You can delete all partitions and create again with this command
following commands will remove all data so be careful .
dd if=/dev/zero of=/dev/hdX bs=512 count=1
OR for sata disk, use the following syntax:
dd if=/dev/zero of=/dev/sdX bs=512 count=1
In this example, empty sata disk /dev/sdb, enter (you must be login as the root user):
dd if=/dev/zero of=/dev/sdb bs=512 count=1
fdisk -l /dev/sdb
Firts you need to install an AV and make it scan your computer