Well, when I was a child, the oldest (and only) computer we had was a Dell Dimension desktop, which had Windows ME, and probably a Pentium 3 processor. I know people say lots of bad things about Windows ME, but it really wasn't that bad, from my experience at least. I never had any Blue Screens of Death, all my programs and games worked, and it did everything I needed. We used that computer from around 2000 to 2006, believe it or not. Our next computer was another Dell Dimension, this time with Windows XP Media Center Edition, which is still hooked up in the basement and is now my brother's computer. Nothing much to say about it, other than that it was our main computer from 2006 to 2009. At that point, we purchased two Dell Inspirons, one for me, and the other for the rest of the family. (I was given my own because they were tired of me screwing up the family computer by getting viruses from a keygen program and attempting to install Ubuntu, and failing, hard.) That Dell Inspiron is my main computer nowadays, and it is the one I use right now. It's rather low-end nowadays and I'm overdue for an upgrade, which will hopefully occur in a year or two. I occasionally use the family computer when I have to work on a school project, as it is the only one with a printer hooked up to it.

Wait, we were talking about old computers? Oh jeez, sorry. I got a little off topic. But I still have some more to say, that is, if you even care by this point...

One of my most active (and strangest) hobbies is collecting and using old computers. Most of my old computers are laptops from the mid to late 1990's. Two of them are Toshiba laptops, and the other two are Apple iBooks, aka the consumer laptops Apple made before the switch to Intel processors in 2006. My Toshiba laptops are a Satellite Pro 425CDT and Satellite Pro 490CDT, respectively. The 425CDT has a 100 MHz Pentium processor and 40 MB of RAM, but sadly, the LCD display does not work. It's been gutted out and I've left it sitting in case I need parts from it for my 490CDT. Speaking of which, the 490CDT is a recent purchase, and it has a 266 MHz Pentium II processor and 96 MB of RAM. It had Windows 2000 when I bought it, but it was slow as molasses, so I downgraded it to it's original OS, Windows 95 OSR2, using the factory restore disk included. At the moment, it has Windows 98 SE. I use this laptop to play old 1990's era DOS and Windows games. It can even browse the Web, using a PCMCIA wireless card I bought. It's slow, as you'd expect, but still quite a feat for a laptop of this age. As for the iBooks, one of them is an iBook G3 with a 500 MHz PowerPC processor and around 340 MB of RAM. It has a broken hinge and screen, though, and I'm only keeping it around for parts at this point. The other iBook is an iBook G4 with a 1.33 GHz PowerPC processor and 1.5 GB of RAM. It is one of my main laptops, and I use it to browse the Web, watch YouTube videos, play classic games using emulators, and some other Mac-related stuff.

The oldest computer I've had is a Windows XP computer. I still use that computer now and my family got the computer about 11 years ago It still works fine for almost everything

I have an old windows 96 computer. The great thing is that it works! ( No it doesn't ) 

The oldest computer has to be the widows 96 as well but we got rid of it for E Machines , the only computer I never heard of until My parents bought it.  

I remember 5 years ago, I had a very old computer. I think it was made in like 2002 or before.

I have a vintage Compaq Portable with MS-DOS 3.1, 128KB of ram, and a 4.77mhz Intel 8088 processor. Mine was manufactured in 1986, but they were developed in 1982. It's the very first PC clone.

B619ook : Unfortunately Windows 96 never existed.

The oldest computer that I had was a Windows 95. I bought a bunch of new things for it like a better graphics card and memory, but in the end it was too much for the "ancient" computer to handle. When I turned it on, it started sparking and the next thing I knew, it was in flames. Maybe it wasn't the upgrades, but actually a big mistake that I made? But it doesn't matter. Now there's one less thing to worry about.

My oldest computer was a Dell. It had Windows Me and then Windows XP.

A Dell from the late 90's. I don't have it anymore. I got rid of it a few years ago.

My dad has this cool TRS-80 from the 80s ran unix

My oldest was thrown out a few years ago, but we've had it since end of the 80s beginning of 90s... in other words, before I was even born. Don't remember the model, since the whole thing was torn into metal scraps when I remembered how old it actually was.

A 2001 Windows XP Desktop, a horrible one. WE still have it, it is so slow, and crappy. A hunka junk is what it is. It has a 80GB HD, 4gb ram, and I forget the proscessor. 

Probably the computer that I have right now, the one that my school gave me a few months ago. It looks like it could be at least 10 years old.

Atari ST.

Edit:

#sigh#

http://en.wikipedia.org/wiki/Atari_st

I'm pretty sure I remember having Windows 97 or 98 for years. I don't think I got a new computer after that until around 2005.