Site down due to database problems. We are working on it. Sorry for the inconvenience

Need to repair the existing database - Have done this by downloading and running a repair process on my laptop
Need to upgrade to latest version (ver 5) of vBulletin which costs north of $200.
We need to upgrade because current version works on older PHP versions only. And hosting providers have newer PHP.
Also the current vBulletin version requires to create temporary aggregate tables in MySQL database. Then it deletes them as required. When we moved from dedicated server to shared hosting the MySQL security policies are to not allow any deletion or dropping of tables. This used to cause too many tables being built in memory and then persisted without ever being dropped. On dedicated server we never had this problem because the security policy for MySQL was just for our site and dropping tables was allowed.
Need some time to work out everything. I will get our site up and running for sure. Just need time.