So uh, what i was trying to do was dualboot Windows. Thing Is, i couldn't find my Windows 7 Installation disc (my computer Is shitty ok don't judge). So, i flashed one to a USB using Ventoy. Thing Is, the way Ventoy works didn't work for me. Exactly on the part when you choose the partition to install to.
Adding to It, my USB randomly broke, and now it only shows the letter T when i try to boot to it.
So basically, i bricked my computer until i can reflash a USB, where i will flash Linux Mint on Etcher and forget about Windows.
But uh, i don't have a extra computer, so basically bricked until i can ask a friend or something.
This means, that i won't use melonDS, because this Is a 32-bit Android device. With a MediaTek chip.
So yeah, sad story i guess.

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meh