You can keep your old computer, though I bet it is getting a little tired.
Suggest you update your old system with a new SSD (to replace your dead HDD).
You may want a more recent computer to run latest MAME & emulators anyway. If you get something new(er) with PCIe, then get a CRT_Emulator ("Groovymame") compatible video card as well.
CRT_emulator + Groovymame gives you more options that ArcadeVGA can. Sorry Andy, love your stuff, but I have several ArcadeVGA cards that I'm not using anymore.
You can keep using Maximus, but there are other options available nowadays (Launchbox, Hyperspin, Attract Mode, F.E.E.L.,to name a few).