Er, which system?
Generally, though, it's remove the data for the current (broken) system, remove the upgrade and go back to the previous installation, run that with no data and then look for "backup/restore" and re-import the backup.
Ok, that's pretty much covered by my generic answer.
Find the backup file and put it somewhere safe. Stop, and then uninstall Confluence 4.3. Drop all tables from the database. Re-install Confluence 4.2. Log into it and look for the "import backup" option in the admin screens.
Have a quick look through https://confluence.atlassian.com/display/DOC/Site+Backup+and+Restore
If you know whare this file is, just install a new trial JIRA istance (same old version) and try to import it. In case you don't have it, perhaps you should raise a support ticket in order to find a better option.
I believe that you'll have to clone the database and fix the upgrade in a second instance.
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