I was trying to fix my forum with 3 differnt mods and i messed up and my backup files got deleted. If I keep the same sql database and reinstall the forum software, will it still have all my members/posts/etc...?
If the database hasn't been corrupted, than yes you'll keep everything. If you have lost all the backup files and only the sql database is remaining, there's not much you'll be able to do even if its corrupted anyway (except to try and repair it). Good luck.
if you got the database, restoring the forum is child's play. even if you use all new files, the database will still work unless your db got corrupted.