I don't know officially, but if you haven't made many customizations, you could just blow away the OpenOffice directory in your home directory. Exit all OpenOffice applications and try this:
cd
mv .ooo-2.0 old.ooo-2.0
Then startup OpenOffice and see if you like it. If not, exit and do the reverse to restore. But in the mean time, OpenOffice probably already created a new directory, so you need to delete that one before restoring the old one:
rm -rf .ooo-2.0
mv old.ooo-2.0 .ooo-2.0
On the other hand, if you decide everything is fine, you can remove the old directory.
Alternately, instead of messing with the whole (huge) directory, you could dive down in there and read configuration files and rename one file at a time.