Right, sooo... Where to begin?
Perhaps here?
I'm not sure of the exact time frame but from the memory, this photo was taken some
time in 1994 or 1995. It would appear that I was sitting in front of our Intel 486
(DX2, 66MHz) & playing the game Stunts. It was running MS-DOS v6.22 &
Windows 3.11 combo, which essentially introduced me to the world of computers and
its software.
Unfortunately, I don't seem to have a photo of the actual computer case, but a while
ago I managed to find one on Google that's identical to the one we had (except for
the CD drive obviously, but that's beside the point):

At the time, I was playing pretty much any game that I could find ... such as Doom,
Doom2, Heretic, Prehistorik 2, Rise Of The Triad, Indiana Jones & Fate of
Atlantis, even more "demanding" games such as Duke Nukem 3D, though our system was
initially limited to internal PC speaker & (only) 8mb of RAM.

In fact, it wasn't until 1996 when we finally upgraded 486 with so called
"Multimedia Package" (16x GoldStar CD-ROM, ISA SoundExcel SB compatible sound card,
Target TRG-S25 powered speakers & additional 4MB of RAM). Everything else
remained pretty much the same until 1998 when we finally had to move on, thus we
bought the Pentium II.

Is there any point in discussing this particular machine? I mean, I already
mentioned it zillion times, not to mention that I wrote pages & pages about my
beloved "Adison"
Long story short, this particular machine introduced me to modern-day Windows
environment (Win98, in particular) and I've been using it all the way into early
2000s. "Armed & dangerous" with 64MB of RAM, 6.4GB HDD & Diamond Monster
3DII (3dfx Voodoo2, 12MB) it was one of the most powerful gaming systems back then,
capable of running pretty much ANY game at full settings. I literally spent hours
... if not days in front of the monitor playing Need for Speed III Hot Pursuit,
Carmageddon 2, Half-Life, Grim Fandango, Indiana Jones & The Infernal Machine,
GTA2, etc. Trust me, the list goes on & on.
Alas, some time around 2007 or 2008 it started developing random issues due to
severe capacitor "meltdown" (not to mention that it became severely outdated &
obsolete in just about any way), which made me re-consider using it on a daily basis
& eventually inspired me to revert all the technical changes, hardware specs
back to original layout. Which was obviously easier said than done, so it took me 13
or 14 additional years to FINALLY get it "perfect".

The plan was to restore Adison back to its former self again (which I did, photos
above) & then be able to enjoy playing retro games whenever I feel like it, but
once again the life had other plans unfortunately & due to series of unfortunate
events I had to leave it behind. Technically speaking, I could always go back &
pick it back up, but nowadays I no longer have any storage room to place it, nor I
can afford to have a dedicated retro gaming system in my setup.

As the time moved on & into late 2000s, I kept trying new things, case mods
& other fancy new gadgets but somehow things were never quite the same again.
Hardware evolution slowed down to a crawl & most of the new games turned out to
be a disappointment. I remember playing /some/ games (GTA3, Trainz 2004, Half-Life
2, NFS Underground) but for the most part I completely ignored the modern stuff
& decided to stick with the ones I had from before.
To be honest with you, that was one of the reasons which inspired me to build a
dedicated retro-gaming machine, rather than keeping up with Windows Millennium
Edition. So with dedicated retro machine I was then finally be able to move on to
Win XP.
EDIT
Found more photos:
My old room, as it was back in 2004. Pentium 4 on the left & 6-yr old Pentium
II, "Adison" on the right:
The very final chapter of the "original" Pentium II, Adison machine. It received a
minor overhaul, upgrading the original AGP Rage IIc graphics with Matrox Millennium
G450 DualHead & replacing the original BTC CD-ROM drive with LG one. Please note
that the Voodoo2 (last card, down below) still remained inside the case, as I wasn't
quite sure what to do with it.
The very last photo to feature original components (on top of the case), now removed
from Pentium II machine. This also marked the last era of Adison system to be used
as a regular, every-day machine. Several months later it got moved aside, only to be
repacked in a cheap generic case & eventually be utilized as retro gaming
system.
Replacing the fan/heatsink on my somewhat new Abit Siluro FX5600: