Encrypted Disk Workaround
Grub2Win cannot be installed to an encrypted partition (usually BitLocker encryption). This is because at boot time, the GNU Grub kernel cannot read encrypted partitions. It cannot locate the Grub configuration files and libraries it needs to initialize properly.
The Grub2Win setup program checks the target partition for encryption. Setup will not allow the installation to continue if the target partition is encrypted.
There are two ways to work around this problem:
Option 1
If you have an available unencrypted partition, You can select it as the target and install Grub2Win to it. Then run Grub2Win normally.
Option 2
If you do not have another available unencrypted partition, you can create one as follows:
From an administrative command prompt enter diskmgmt.msc
This will open the Windows Disk Management dialog.
Right click on your C: partition and select "Shrink Volume".
Now shrink your C: partition by 200 MB. This will make room for your new unencrypted partition. You may need to re-boot after the shrink completes and run diskmgmt.msc again.
Right click on the new unallocated space and select "New Simple Volume".
Use the New Simple Volume Wizard to create an unencrypted NTFS partition. I recommend using drive letter G: but you can use any available drive letter.
Give the new partition a volume label of "Grub" to make it easy to identify. Perform a quick format.
You can now quit the Disk Management dialog, and install Grub2Win to the new unencrypted partition.
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