Hey guys, fetch the CDROM image, burn it, and boot it. The endeavor won't cost you any more than a blank CD and a few minutes.
http://csociety-ftp.ecn.purdue.edu/pub/knoppix/KNOPPIX_V3.7-2004-12-08-EN.iso
or one of the alternate sites following the "Download" link in the page I linked-to earlier.
There will undoubtedly be a period of familiarization required, and it will vary depending on how in-depth you want to get with using the system at a lower and more elegant level. For the most part I'd guess a typical Windows user could step right into something like the default boot of Knoppix. Bear in mind that the system will run slightly slower than off a hard drive, and that there will not be nearly the amount of software at your disposal as compared to a typical full GNU/Linux installation (though there may well still be more than what came with your Windows XP!).
I hate being trapped in a GUI so I'm not a good judge, but whenever I have to sit in front of a current Windows box I feel like I've just climbed into a Ferrari which has had it's functionality severely limited, and I've somehow slipped into handcuffs. And I'm not talking about just having to do things differently. Mainly it's that I don't have
any way of doing most of the simple and powerful things I usually do as a matter of course. The tools are severely lacking in Windows.
GNU/Linux itself is not any particular system or method of interacting with it. If you suffer from option paralysis it may be too much for you to undertake. Some of the new "desktop" environments, notably KDE and GNOME, are actually too Windowsy for my taste but thankfully I have about a hundred other options at my disposal. I'm currently running KDE but am not using but not much of its integrated functionality. I like the browser very, very much and there are some really nice other features.
Bill Gates started out decrying Linux as old technology, but he's quit doing that now that he's trying so hard to play catch-up.
Fetch the CDROM image, try it, then ask pointed questions, okay?
Glen