how long do you wait? cause its possibly its just not long enough...or maybe your just have the "redhat issue"
with rpm packages which is solved by typing:
rm -rf /var/lib/rpm/__db.*
as root...and then trying to install the rpm again...but in any case i will post the link to the step by step i posted on LQ.org that has a complete success rate, so if you wanted to do it yourself then look at this