For the most part, I like the new design. I have similar complaints about the screenshots that others have had. I will add that I don't think we need to see the entire desktop when looking at the screenshot of 7-zip. You might have better luck cropping the images a bit.
However, I have one more complaint not mentioned.
I didn't know how to get out of the screenshot and back to the regular window. I didn't see an "X" to close it, clicking on the image didn't work, nor did most other things I tried. I finally discovered that the "Esc" key works, and that clicking on the black area around the image works. But you might want to tell people somehow that is how you close screenshots, or they might turn away from the CD fairly quickly. Of course, this may be a standard thing with Kiwix, but I have never used it before, so I wouldn't know... but then, if I don't know, others probably won't, either.
I also didn't see a splash screen during startup. Is that just not implemented yet, or is that not going to be a feature?
The first time I put the CD into my system, startup seemed a little slow compared to what I am used to, but maybe that is due to the lack of splash screen, so it just seemed longer. The second time I tried (and subsequent tries), it seemed much faster than I am used to, so a splash screen probably isn't needed.
Otherwise, good job. I look forward to seeing the final release.
BTW, I tried mine on WinXP Pro SP2.