Vista - icon screen white -- desktop missing

After unsuccesful RC1 install and return to beta 2, one user w/admin
privileges has icons in separate white screen as in windows explorer. I can
display as detail, various sized icons etc. I cannot, however, get to the
desktop page. There is no X to stop explorer or whatever it is. None of the
"Personalize" settings remove the page. Show Desktop from quicklaunch will
display desktop for a split second before dropping back to the snowstorm. It
worked before going back to beta release 2 It also works fine when logging in
as Administrator.