Not so fast... that's almost 1200 member files...
First, find the thread in chit chat about UBB V6 with copy cat's script to deletehacklines.pl . It works real well...
Make backup copies of your member folder, run his script, delete your ubb cgi files in your ubb cgi directory (
not the Members folder/files), install a fresh set of non-hacked v5 files, and then re-install UBB V6. Things should be back to normal. You should be able to save all member files and posts/threads.
Post in here if it isn't working.