Welp just fixed it. I think it was a DirectPlay issue with Windows 10.
Had to go to C:\Windows\SysWOW64, find the file called "dplayx.dll", and give myself full permissions in the security options of it's properties. After that, I enabled DirectPlay in the Windows' Legacy Components. (Control Panel > Programs > Turn Windows features on or off > Legacy Components > Tick DirectPlay).
Program runs completely fine now. Cheers.