Very grateful for the additional helpful comments. Have succeeded in accessing BIOS to amend boot order which was a major relief. I think I'm already to go tomorrow with making my first full back up on Acronis but just need quick confirmation of 2 more points. With reference to one of my earlier posts (see above), I presume I back up my entire Disk 1 (containing Acer (C) and Data (D)) Is this correct ? And, do I also back up Disk 2 (containing NV Cache) ? Once again, my apologies if these questions are very basic but I want to be sure I get things right.