Windows 8 Resolving GRUB Issues After Dual Boot Installation of CentOS and Windows 8.1

[pingopower]

Hello, please, thanks, bye !

I install CentOS in dualboot with Windows 8.1, problem, GRUB don't have Windows 8.1 Entry, so i insert a DVD of Windows and i run the cmd fo repair boot, i do "
bootrec /fixmbr" and "bootrec /fixboot", i rebbot and after the BIOS image i have a
flashing dash in infinite, what a should do ?

 

[pingopower]

But i want to conserve personnal files by an windows.old

 

[Jimbo22]

If all other avenues to fix your issue has failed, then a complete format and clean install is your only option. Like I said previously, check with the linux distro you have for a forum for some answers to your issue.

 

[Saltgrass]

There are so many questions that can be asked in a situation such as yours.

As now has been mentioned, is one or both installs configured as UEFI. It makes a big difference how the configuration is set.

But since you have done some basic Boot configuration changes, for now I will ask one question. When you go into the bios or open a Boot Device Menu, what options are listed, exactly? If you see one that mentions a "Windows Boot Manger", choose it and boot.

If you don't have any bootable option, a picture of a Diskpart listing from the Command prompt might help us see your situation. Open Diskpart then use a list disk command. Pick the disk number you want to check, probably 0 and type the commands below.

Diskpart
list disk
select disk 0
list partition

Maybe use a camera and take a picture of the readout.

If you don't have any boot options which lead to Windows, the only other thing I could suggest is using a command to set the boot back to a Windows version. This is only usable on a MBR (Legacy) install and will not help a UEFI install.

Bootsect /nt60 all

http://technet.microsoft.com/en-us/library/cc749177(v=WS.10).aspx

But, as Bassfisher says, it may be best to reinstall. Using a Linux live Distro to recover files from your drive may be of help, or place the drive in an external caddy.

 

[ussnorway]

Can you comfirm for me that you did a system recovery from a windows 8 (or 8.1) install disc and that has failed?

If the above is true then your windows is gone and I would move on to a fresh install as bassfisher6522 says... in fact, I would also insert a new (blank) hdd first so the old files can be recovered after but perhaps that is outside your budget.

 

[pingopower]

The solution is to install ntfs package on linux distro and reload grub2 je automaticly détect win8 and add it to boot, thandicape for everything !