Installed Ubuntu and lost access to Windows

Question

I installed it by using a load of unallocated space on a completely separate hard drive than the one Windows is installed to.

When I choose Windows on the boot menu I get this:

'Invalid EFI path'

Any idea why this is?

EDIT: Here is information from boot info script. http://paste.ubuntu.com/1202156/

I think it might be because I have more than 4 partitions on the drive? Although I am not sure what the one labelled as 'unknown' is at all.

Answer 1

1. If you using EFI, install grub-efi: apt-get install grub-efi
2. Use "Separate /efi" option of Boot-Repair.
3. Then force your BIOS to boot into Grub EFI partition

This works for me every time. Good luck!