I didn't use a guide. I can make one later today.
- Put in linux with USB like you did when installing your first distro.
- Boot from USB, install a program called gparted.
- Resize root partition by about 70 Gb. Do NOT resize or move other partititions.
- Put windows into a USB, can get one of the jailbroken ISOs like tiny10 too.
- Boot from windows, select the empty 70Gb space when windows prompts you where to install.
- Turn off windows updates because it sometimes deletes linux bootloader when updating.