Well Guillaume, you can trash the Amiga ball for starters
I remember way way back using Neodesk. AIRC, many packages use to come with a few of the popular desktop's icons. Might have to dig around.
Not saving desktop or settings?
Try renaming the desktop.inf file to desktop.inx
Reboot, you shouldn't see but basic icons.
Configure a few then save desktop.
Check to see if the desktop.inf file has been created.
If you don't see it, dig around to find where it's being saved to.
I'll bet the path is set to somewhere besides root.
Just a guess.