Since she'll need a new hard drive, you might as well start there and just add the hard drive?

A few years back, my grandmother was about 90, my aunt bought my grandmother a new PC with a big LCD screen they sell these days, so she can see things better. Of course, since I was there, I was tasked to setting it up. I believe it was Windows 10. And after getting it started, and providing some basics she was looking for, we sat her down and showed her. I wasn't too familiar with using Windows 10 on such a large HIGH DPI screen, and quickly realized, despite being 27" or whatever would have been plenty big, at 2K or 4K resolution, was way more tiny, and to make things worse, the thin lines Windows draw windows, and white everywhere, makes it even hard for me to find the mouse or interact, and causes windowing UI to blur together. It has certainly soured me further on why in the world we moved to high DPI, especially I need to stand like 10 feet back to compensate. Of course I made things sort of better by 2X'ing everything. I certainly felt disabled using it, and I don't have vision issues.

I think in some ways, why rock the boat hardly at all. Just fix and move on. Anything you do will likely last long enough. Sometimes I wish I'd just give my grandmother a DOS PC again, just like I set one up for her over 30 years ago... because all her files she really wanted to still use were from those days.

1. The easiest way to solve the problem! maybe you could check the board for bad caps, otherwise I would go this route!
2. I have been running for the last 10 years a socket A system with no problems whatsoever. I must point out that the power supply was new back when I build it! The system: Athlon XP 3200; 2*1gb DDR; Abit AN7; geforce 7600gt; 150gb raptor; Corsair RM650 PSU.
3. I would not install Windows 98 on anything beyond socket 754 for AMD and socket 478 for Intel.
4. At my job we tried virtualization and it never worked 100%. We still use original hardware - that is pentium 4/D machines with Windows 2000 to run the equipment! I changed the PSU's to all machines and they still run just fine 21 years after first startup!

I'd add redundancy, raid it to avoid issues.
Mirroring.

Thanks for all the suggestions. I’ve been pretty busy lately so doing a backup, the storage upgrade and calling it a day is attractive.

Hard to do the mirror in Win98 unless I use a promise fast track controller. I guess that’s an option. I got the controller and it’s not doing anything.

I might spend a minute on the virtualization option to see how that goes. It’s not like the thin client is doing anything either.

I would just put that fasttrak in with two bigger ide disks.