PokerTracker

First off, I have about 55,000 hands in my PT3. It has been running a lot slower lately. Is it because of all the information i have in there? How do I delete the hand histories without deleting my results.
Second. I created a new database to try to make it go faster but i didn't change a tab from my previous database to my new one, thus my most recent importing of hands of about 350 all came in with errors. How do i now export the hands and do it all over again?
Third. I don't know where the utilities section on pt3 is or how to get there. I have tried for a little while but have no idea how to purge or get there. If I wanted to delete all my tournament histories, like I've never played any tourny's; how do I do that?

Thank you for your help in advance.

If it errored, the hands weren't imported into the new database. There's no way to selectively export and/or purge at this time.

Try clustering and analyzing your databases every 50k hands or so. That should improve performance.

That doesn't sound like too big a DB, so should be OK.
The other things you want to do are accessed through the Database Management window. There is an Export button which will allow you to export those hand histories to files which can then be imported into the correct DB.
Purge and Delete DBs is there too, though there is not yet a partial/selective purge.