Reminds me when I replaced some of XP's files with 2000's, but not a lot of them worked
Windows XP for me as well, purely by choice (this quad core could easily handle Windows Vista or 7, and the only old hardware I have that might not work is my webcam from 2001) ... although that's more from experience with Vista at work, Windows 7 looking mostly the same except the new taskbar, and me being used to XP after 8 years
Of course, the XP I got to love after all this time has been tweaked quite a bit, and I'd be doing the same with Vista or 7, but there's still too many reasons not to update:
- I always hated
Vista's buggy/bloated/uncustomizable Explorer (I don't want the breadcrumbs, command bar or search box, why can't I disable them? And why is the filesize display still broken after 2 service packs?), and 7's doesn't look like much of an improvement ... sure, XP's defaults sucked too, but it could at least be changed to
this
- I don't want to infect my system with the winsxs virus (supposedly a "feature", but whatever), which tries to fix "DLL Hell" (when was it a problem on XP, again?) by introducing another hell, and eats gigabytes of disk space ... even though Vista seems to run fine with
most of it gone (
and more)
- Aero does look better than Fisher-Price, but I use classic anyway ... and if I wanted a theme that bad, a custom one on XP would do the job as well (minus the transparency)
- Most of the "new in Windows 7" features listed on microsoft.com (last I checked anyway) were things I can already do on XP or just don't care about
- When I tried Windows 7 RC1 (not sure if that still happens with RTM or SP1), my desktop background was blurred a bit
- I multitask on XP with under 1GB RAM usage most of the time, about what Windows 7 needs for the average startup (but I have 4GB anyway, and no use for more yet)
I admit I haven't really given Windows 7 a chance yet (barely tried RC1 or used any computer running it), and it does have some real improvements, but I just don't have enough reasons yet ... maybe when I'll really need 64bit, or too much stuff drops XP support, or if my next computer (in a few more years?) can't run XP

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