Preface: I have search many posts already to try and answer my issue, but haven't found any that help w/ my specific issue. Searched posts found in post-script section.
I have a Lenovo Y700 with nvidia geforce gtx and Windows 10 preloaded. I installed Ubuntu 18.04.1 LTS as dual-boot. Everything was working fine for a bit until Ubuntu would not start. Now, I choose ubuntu from the GRUB Startup and get (sorry for image quality, it's a photo of the screen since I can't screenshot): Ubuntu start-up screen
The start-up screen stays like this indefinitely. So, what I'd like to do is uninstall Ubuntu and re-install.
Since I cannot work inside Ubuntu everything needs to be done in Windows, but I don't have the Windows Installation CD.
I don't want to delete important partitions and can't use GParted. Here is my Disk Management: Disk Management window
So, please advise in which partitions to delete, and any necessary steps to uninstall Ubuntu, then re-install Ubuntu 18.04.2 LTS. Thanks in advance!
P.S. I've tried this: Windows 10 corrupts Ubuntu 18.04 partitions, and get e2fsck: Cannot continue, aborting. I've reviewed this: How can I find out which partition Ubuntu is installed on? I've reviewed this: Reinstalling Ubuntu with a dual boot. Here I followed the steps to Create a bootable USB stick on Windows and tried booting Ubuntu from USB. This gets me to the same Ubuntu start-up screen image from above.