Hello to everyone out there. I am a non SQL person TRAPPED in a nightmare!

The long short is we have a CRM 3.0 database that is running in SQL 2005 on a Windows 2003 SP1 Server. (HP ProLiant ML350 3.0ghz 3.5gb RAM)
Server started running out of drive space and could not hold transaction log. Would basically lock up everyones sessions until flushed. Put a cap on log size until drives could be purchased and installed. Perfomance...