If you are running the standard xandros EEE OS, and you have changed some configuration, and you are now having trouble un-changing it, do not forget the "Factory Restore" option:
Hold F9 during bootup.
Highlight "Restore Factory Settings"
Your EEE will be "as new", so if you have any important data on it, you need to back this up first.
My EEE701 is currently happily running ubuntu 10.04 (had to plug in an SD card to get enough memory though).
I hope you have found http://wiki.eeeuser.com