I made the stupid mistake of thinking that if I remove my gentoo linux disk and then installed windows on a separate disk I could plug my Gentoo disk back in and everything would be fine.
I tried using my liveusb and chrooting into my install and reinstalling grub, but when I reboot it still boots straight to windows. Any suggestions on how to fix this>
my motherboard is a MSI - h87-g43 with a haswell cpu and the settings are all default atm.
and my lsblk would look something like this