pradeep.mohan (9/10/2013)
backupfile - 44095724backupfilegroup - 22047863
restorefile - 974
restorefilegroup - 487
restorehistory - 487
backupmediafamily - 22047869
There is your problem. You have LOADS of backup history. The GUI is trying to read those tables and you don't have enough memory. You can cleanup old history using sp_delete_backuphistory.