grub error - cant boot windows

[Moltke]

Hello, i tried to dual boot windows 7 and linux lite in my hp all in one omni 120. At first i had this problem "No EFI system partition was found". So i search in some forums and the solution was creating an Efi partition (256MB). After this linux lite started the installation but at some point it fails and show this error: “executing grub-install dev/sda failed" "fatal error".
Again looking for a solution ive reached this website that says enter in live mode and execute some commands in the terminal to solve it, the problem is that when i tried to launch in live mode it "crashes" and shows the entire screen in one color and start switching colors in loop.
The other problem is that i cant boot in windows because the bootable option doesn't appear anymore in the Bios.
Images: https://drive.google.com/drive/folders/1...sp=sharing

Fisrt, there's a UEFI dedicated section on the forum you can use in the future https://www.linuxliteos.com/forums/uefi-secure-boot/  Second, you might try this https://www.supergrubdisk.org/category/d...ux-stable/ download and burn to a USB, boot the OS and it has a nice tool with some easy to use options for rescuing/fixing your system



As you can see in the image above it has some options for windows. I haven't used this for rescuing/fixing windows' systems but it does work pretty good with Linux. Also, there's a Spanish section here https://www.linuxliteos.com/forums/spanish/ for us Spanish speakers in case you need to post in that language since I noticed in your screenshots that's your lang and it is mine too

Hope this helps!