Your problem maybe related to wear&tear on the system and/or you did a reboot and it couldn't clear itself. Being "ON" all the time isn't a problem, but if there's a heat related issue it can't recover as it should. Windoze 2K is pretty stable but you do need those updates for security if anything else, still effects older systems. Since, a reload was done or it recovered, just beware now. If the problem returns, shutdown entirely when you don't use it, like overnight. If the problem persists, then you got you're $50 out of it for a years use. Adding more $ to fix it maybe less cost effective, up to you. When a blue screen appears, note down the error, and google for it to understand what it is. Iy may give a better answer to recover from that. I strongly suggest as well, you install the most ram that system can handle, to elevate that as a problem source.
I have an ancient Pentium 4 that is running windows 2000 professional which I bought last year for $50 through a group that recycles old computers. Its actually been working great except for the fact that it is desperately slow. Because it is so slow we don't shut it down unless we are going away for a few days or something like that. Earlier this week when I got up I turned the monitor on and there was nothing there, moving the mouse or a key on the keyboard did nothing and I had to use the reset button to get it to do anything. The next morning it did the same thing. Once it did come up I went to check my e-mail and all of a sudden the screen went blue and i got a message saying it was performing a physical memory dump. It wouldn't do anything else, just kept going to this screen. I talked to someone at Staples and he said I would have to reinstall windows to get it to work again or buy a new computer. I found someone who would reinstall windows so I took it to him yesterday and when he went to do it the computer was fine. Any ideas what might have happened? All of this happened after it successfully installed some new Windows updates.