I have a similar problem, I just put 8.04 32 bit on my XP box with an ATI 9500
series video card and it locks up whenever I try and change the screen saver.
Actually it locks up as I'm selecting and previewing the different sceen saver
choises.

I just tried a live CD of 8.04 64 bit on a Vista box and the display flickers
badly, Samsung 2253bw.

I wasn't expectimg video driver problems, but both machines are experiencing
video display problems although they are somewhat different.