When you get memory error messages that happen all over the place, in any and every application, that is usually hardware-related like the memory or motherboard. But in your case, since it happens in one location, in one application, it usually means that you have file corruption in that application.
I think you should repair or re-install BE.
A severe application error has occurred.
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Stack Trace: at BackupExec.UI.BEDlgs.ConfigureRecipients()
at BackupExec.UI.MainForm.ba(Command A_0)
at BackupExec.UIFramework.CommandManager.a(Object A_0, EventArgs A_1)
at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at BackupExec.UI.MainForm.a(String A_0)
at BackupExec.UI.MainForm.b(String A_0)
Full Hardware Test Was performed and no error was found in hardware.