problem starting 7.3 server

hi
I have installed the newest 7.3.1 rpms for RH 7.3.
before I removed the 7.2 binaries with rpm -e

now I get this error:

/etc/rc.d/init.d$ sudo ./postgresql start

An old version of the database format was found.\nYou need to upgrade
the data format before using PostgreSQL.\nSee (Your System's
documentation directory)/postgresql-7.3/README.rpm-dist for more
information.

but in this file I can not find information about the data format
or I have overseen it. I even made a $ grep -i format
with no proper result.

any ideas what to do ?
I have no important data so it would be possible to remove
the old databases but I do not know if this is the solution.

markus

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