You don't say anything about your layout. Is everything on one drive or
partition? You did a clean install from CD of what? 9.04? Why not install
9.10 if you are doing a clean install? Also you say you backed up your data.
When and how did you import your data? How did you back up? Did you use the
command line or did you use Nautilus to back up?

If your setup is the usual with everything residing on one partition you
should consider having a custom setup with /home on its own partition. Then
you would not need to back up your data. You just reuse your old user name
and set the mount point for /home to your old /home partition. If you do
have to re-install consider this option. It saves tons of work in the long
run. I can step you through the process if you like.

However, assuming that you have no separate /home partition, all is not lost
as long as you have you old data still intact. Usually things go smoothly,
but the odd time the installation process goes awry and you need to start
again. I know because it has happened to me more than once. I do lots of
installing.

If this was my system, I would install 9.10 from scratch and then once you
have it installed, I would use the Live CD a second time and copy all files
including hidden files and folders from the backup of /home to the new
/home. Then re-boot into the new system. I would seriously consider a
separate /home partition. Once done you never have to do this again.