I'd like to add something to this. I did more research on the DirectX issue, and found a potential solution I hadn't tried before, and figured "why not?" When I tried it, it actually WORKED, completely refreshing DirectX and letting everything run properly! The solution was: Device Manager > Uninstall the graphics card & drivers > Restart computer. Taking these steps was able to completely fix my issue, somehow. I felt like I should post this solution here, in case others run into this issue in the future. It may not work for everyone, but it worked for me. I do wonder, though- why DID it work for me? What exactly did this do?