Computer Can not find hard disk after installing Sophos XG home

Helle everyone

I'm having problem with my installation av sophos xg home.

I have downloaded the (SW-17.5.3_MR-3-372.iso) and used the Rufus 3.4 to make my USB instalation disk, and it went well with the instalation and rebooted, but it can not find the boot disk.

i get a message ( Please install an operating system on your hard disk ) & ( Hard Disk - (3F0) )

and when i looked at my computer hard disk via (PartedMagic) i see that there is no any partition on my disk, it seems that the sophos has deleted my disk partition. 

i hope that you can help, im really intrested in trying the sophos firewall on my desktop.

Best regards

Al