Site Security Issues

Well, the site was locked down by my hosting provider for a while over the weekend while I was at a Sci-Fi Convention. I didn't find this out until I got home on Sunday. Apparently there's a security issue in Drupal 4.7.5, which our site runs on. I first tried to update to Drupal 5.1, but that made the Forums, Gallery and Theme incompatible. Then I learned that there's an update for Drupal 4.7.6 that will allow us to keep all the compatibility. Luckily I backed up the site directory and the MySql database, so I was able to roll back from the 5.1 upgrade. So I'll be updating to that today, and updating the theme, so if the site's acting a bit wonky, that's why. Wish me luck.