I had a dual boot installation, had W7 installed first and later created a dual-boot system and added W8.1 on a 256GB ssd. I am not using W7 anymore so I went back to a single boot configuration some time ago. As I was running low on the diskspace on that ssd I decided to get rid of the W7 particion which HDM 14 let me do without any problem. Only to find out now that W8.1 was apparently using the boot manager on the W7 partition and I could not boot any more. So I am stuck! I have now installed W8.1 on a second ssd and reinstalled HDM 14 in an effort to get the boot manager and boot sector installed on the original ssd which now only has W8.1 with all my software installed on it. However, I can't get into Setup Boot Manager, it's greyed out much to my surprise. Is there another way to get my problem solved? I would hate having to re-install all my software...
If you are using a UEFI system, the boot files are in the ESP partition, which is the boot partition. Try the Boot Corrector from a boot medium. Supposedly this tool can solve this type of problems.
From features on HDM 14 & PM 14 "Boot Manager - Easily manage several operating systems on one computer (32-bit version only)"
