Each of these gives you a description of what the option does. You can also find these options listed under the tabs at the top of the document such as File, Edit, View, Scan, Configure, Histories or Help. This screen shows you the File Realtime Scan Statistics from your computer. Scheduled Scans is used to designate a specific time to scan your computer. Quarantine is an option to view files that have something, possibly a virus wrong with them.
Backup items gives a variety of choices for backup of files.
Repaired Items will list certain items that have been moved to the Quarantine and then cleaned of viruses. Items are placed in this special location when the original location is not known. For example, an infected attachment may have been stripped from an email and quarantined. After the item is cleaned and moved to Repaired Items, you must restore the item from Repaired Items and specify the location where to restore it. You can scan some or all of the files on a floppy disk.