That BIOS looks a lot like my Gigabyte 785 series. First step is to put the DDR2 Voltage Control to +0.3 to take it to 2.1V. This will be in RED numbers, don't worry about that. Then re-boot and see if it comes up at 1066. If not, then change Memory Clock to manual, reboot. Then Memory Clock to 5.33 and all should be fine.
Once you've got it at 1066, you might go into the DRAM configuration and note the Auto settings. They should be higher than the 5-5-5-18 you see now. You can try setting them to manual and change them to the 5-5-5-18 settings designed for the 800 mode - but be sure to test for stability afterwards.
The SPD/EPP profile will show settings for 533MHz when all is correct and should be picked up by the BIOS. There's no setting to turn on EPP.