While I was at my father's house, we tried installing a few operational systems on the extra HDD he had. We first tried Windows ME, which actually
did install. The USB mouse wasn't working so we could only change the settings by using the keyboard. That said, it did not run at all. My father was wondering how it would react to being installed on a CPU way more recent than itself (an Intel DualCore E5500), and apparently it just decided not work at all. Welp. Getting the installer to boot was interesting too, we had to mess with some MS-DOS tools and Windows 98 files to create to make the right config for it.
After that, we tried installing Windows 10. None of the two DVDs worked, they each failed at different points of the installation with unknown errors, and mixing both of the DVDs worked for some time until it tried to get a file that apparently wasn't there anymore and then it failed as well.
Since then, he tried testing some other things. Apparently my old motherboard is simply crash-fest city, but the old GFX card seems to be working well for some reason? Either way, I'm still going to use the onboard one and wait until I can buy another better one (it was supposed to be this month, but with the HDD problems and all that, it got postponed to July).
Eventually™ it will be done.
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"The quieter you become, the more you are able to hear." --Ram Dass