redsnapper, I've been using WebWizForums for several years now. I've had very good luck using the MS Access and MS SQL and even on MySQL. Most of the time this has been on shared-host servers. I've never suffered data corruption. If the one and only step that got your site running again was the restoration of the admin password and salt, something other than corruption was probably the cause.
Once you have the site running again, I suggest you make a complete backup of the MDB, since it's so small anyway. If the same problem comes up again, compare the backup password and salt to the live copy. If they have changed, then someone is probably accessing your forum with privileges higher than you expect. Set and check the admin email address.
You didn't say so, but I'll assume you changed the admin password immediately so that it is no longer "letmein".
I think you were also having problems with the security code that someone suggested could be due to your server not maintaining sessions. I think this problem could also be related to session state problems. Do your other asp pages depend of session variables?