>> Was the operating system still usable?
It is – at least the DOS part of it. Windows works fine but it is not as stable. I believe the old motherboard or some other component (RAM? GPU?) is not at 100% health there…
>> Did you still have your old saves?
Yes, as long as the hard drive is working (*knock-on-wood*), I still have my old saves. However, many years ago I’ve grabbed my entire collection of DOS games and software, off that PC and into my DOSBox folder, and I keep copies it on some of my modern PCs. Therefore, quite a few games that I’ve played and replayed since, have newer, “better” saves, and not all of them have made it back there. 😀