Reinstall Grub after installing windows

Boot from a Live Linux USB drive. You can use any Live Linux distribution for this, such as Ubuntu, Fedora, or Debian.
Once you have booted into the Live Linux environment, open a terminal. For example; Ctrl+Alt+T
Type the following command to list all the partitions on your system:
```
sudo fdisk -l
```
Identify the partition where your Linux operating system is installed. Note the partition name, for example, /dev/sda1>/code>.
Mount the partition with the Linux operating system:
```
sudo mount /dev/sdx1 /mnt
```
Replace /dev/sdx1 with the actual partition name.

Mount other necessary partitions:

sudo mount --bind /dev /mnt/dev

sudo mount --bind /proc /mnt/proc

sudo mount --bind /sys /mnt/sys

Chroot into the mounted Linux partition:
```
sudo chroot /mnt
```
Install the Grub bootloader:
```
sudo grub-install /dev/sdx
```
Again, replacing /dev/sdx with the actual device name of your hard drive. If you have more than one hard drive, make sure to select the one where the Linux operating system is installed.
Update the Grub configuration:
```
sudo update-grub
```
Exit the chroot environment:
```
exit
```

Unmount the partitions:

sudo umount /mnt/dev

sudo umount /mnt/proc

sudo umount /mnt/sys

sudo umount /mnt