So this is my first time installing a second OS on a PC. My tower is running Windows 8 64-bit, and I installed Ubuntu 13.04 from USB following the official instructions. My tower has 3 hard drives, a 1TB HDD (with Win8 on it), a 2TB HDD, and a 60GB SSD. When I first tried to install, the Ubuntu installer asked to install on the SSD by default, and I allowed it to. I was then unable to actually boot to the install I had done (putting that drive first in the BIOS boot order did nothing), so I decided to reinstall.
I launched the live USB again and chose to install on my main 1TB drive, alongside Windows. I created a new partition following the top answer on this question (making it an ext4 with mount point "/"), and lo and behold, the installation goes without a hitch. However, now I can't boot at all - I try to start my computer, and when it loads my 1TB drive I get a flashing command prompt bar.
I once again launch live USB and find a guide to reinstalling GRUB (sorry, can't find it right now), which then allows me to see GRUB when I turn my computer on and boot from my 1TB drive. Ubuntu launches correctly, but when I try to launch Windows 8 now, I get a message saying it's preparing automatic repairs, and then attempting repairs. It sits on that screen indefinitely apparently (I left it for 20 minutes with no change).
I really only needed Ubuntu as a clean workspace for phone modding, but Windows 8 is where I kept all my stuff. I'd really, really like to hear that I haven't broken everything. Anyone have advice for me?