quite firefox
go to this directory
C:\Documents and Settings\problem-user-loginLocal Settings\Application Data\Mozilla\Firefox\Profiles
delete all contents
go here
C:\Documents and Settings\problem-user-login\Application problem-user-login\Mozilla\Firefox\Profiles\
open the default folder there
copy bookmarks.html to the desktop
backup one leve and delete the default folder
now launch FF and it will rebuild the profile for that user.
go to www.google.com
quit the browser
COPY bookmarks.html on the desktop back to C:\Documents and Settings\problem-user-login\Application problem-user-login\Mozilla\Firefox\Profiles\
open the default folder there
next operation of FF will retain your bookmarks and should be good to go