Actually because I can't use OS/2.
I used OS/2 3 Warp in the '90s and I think it is the most stable, user friendly PC operating system ever, even nowadays. Unfortunately it's almost dead (IBM tried to open-sourced it several times but Microsoft vetoed it always). Currently there are "eCom Station" but it isn't the same and cannot compete with Windows in the most modern computers.
When I changed my home computer and I realized that I cannot use OS/2, I moved to Linux (Redhat IIRC). I was using it occasionally and I found it recovers from my programming errors better than Windows.
Xubuntu in both computers (an old IBM desktop and a new DeLL laptop), but I'm tempted by Mint.
The IBM has an OEM WindowsXP too. I use it only to play and to test the Windows version of Allegro.pas.
Not sure why but I never have it tuned perfectly, may be because Xfce has fewer support than famous KDE and Gnome, but my home computer isn't powerful enough to support anything "bigger" than that (good old Pentium IV 1.8 Ghz). By the way, the latest Xubuntu (11.10) seems to be much more stable, less buggy and more ease to configure than previous releases, but it's slightly slower.
Unfortunately, Intel graphics support is broken. I've read that they know why it doesn't work (the driver doesn't reserve the graphics RAM correctly as it's shared with conventional RAM so system and graphics becomes mixed after some time...) but I don't understand why they decided to drop off the OpenGL support instead of fix it (Windows XP has full OpenGL support and it's fast and safe. Actually old Kubuntu 8/9 had full OpenGL support and was fast and stable!). AFAIK this problem isn't fixed in any Linux.
The DeLL laptop has an nVidia that works, but I've found that it isn't able to render some effects. Not sure if it's problem of the graphics card itself or because I didn't configured it correctly or because I'm using the open-sourced driver.
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