How should I wipe Windows, two Ubuntu studio partitions?

Succinctly: I want to wipe this machine, and install something that will get me closer to the command line, but also easily integrate a nice slim GUI that draws on Windows and Mac.

In more detail:

I have a Windows seven machine with some weird file structure. I don't have admin or root privileges. I've got a boot disk for Windows seven. I took a UNIX class and thought I'd be fine adding a partition of Ubuntu studio... And I was not fine. Attempts to fix this on my own has made it worse... There were some hardware issues, so I may need to repurpose this to parts. It was a hand me down, and the previous user liked clickbait a lot... Which makes me want to not give up if it is a software problem.

It boots into Windows 7, but Is really slow. I can't log into either of the Ubuntu partitions, and I don't know how passwords got onto them. The installs seemed... Very sketchy. By the time I hit a command line, I tried ls and couldn't figure out what exactly had happened. A friend suggested arch Linux, but by that point I couldn't get back into the partition. Another friend gave me a flash drive to boot from. Bad timing led to leaving and allowing the battery to die mid install.

Right now I'd love to replace every bit with a zero, then install something that will have a GUI, a nice lack of granting execute permissions, and begier friendly documentation.

After that, functionality for a virtual machine, specifically Windows, with the intention of using solidworks and some other programs that the college I'm attending only has Windows licences for would be nice.

A DAW would be very nice as well, something like pro-tools with support for focusright interfaces etc.

Also, as a note on Windows 10, it failed to install on this machine, repeatedly, which was one of the factors leading to the Ubuntu installs.