Ok lets get this BIOS configured. I'll outline generally what you should set in each of the menus. I'll assume your BIOS is similar to the one in the manual, with the menu options across the top, starting with "Main" and with "Exit" last. Tell me if some of the things I say arent in your BIOS, as the one in the manual is probably the original version, and your mobo probably has a more updated version already (the manufacturer pre-programs it with the current version at time of manufacture). Anything I dont mention is either not in the manual or doesnt need to be changed.
Main: Fairly simple here, just set the system clock if its not already correct. Make sure if you have a floppy drive, the "Legacy Diskette A" option is set to the default of 1.44M, 3.5 in. You cd/dvd rom drive should be listed under one of the Primary/Secondary Master/Slave options, as well as your HDD if its not a SATA drive. SATA drives will be under the "Sata" menus. SMART monitoring you can leave enabled or disabled, depending on whether you measure hard drive temps etc.
Advanced:
JumperFree Confguration - Even if you dont intend to OC, in the Jumperfree Configuration, set it to Manual.
J/F config -> Frequency Control - Set the System Clock Mode to "CPU/MEM manual-mode". New FSB Speed should be around 1066mhz I think if its talking QDR. Make sure New MMEM speed is whatever your RAM is to run at, which from what you said before, is 667mhz (or as close as possible to that).
JumperFree Configuration -> Voltages Control - Under DRAM voltage, set it to +2.000V (this is what I found on the PQI site, if you know that your RAM is different, set it to that). Set the Vcore to 1.3250V.
PCIPnP - Set the pri. display adapter to PCI-E.
Onboard Device Configuration -> IDE Function Setup - Turn off anything not being used. Eg, if you have a DVD Rom drive as IDE Primary Master, a SATA HDD in port 2, you can disable IDE Channel 1 and SATA Port 3,4. Refer to the Main section to find where you have installed drives. IDE Channel 0 = Primary Master/Slave; IDE Channel 1 = Secondary Master/Slave. If you have any problems booting into windows, then just enable everything. Its more to save a small amount of system resources, but its not necessary. Leave DMA transfer and Prefetch options on "Enabled".
Onboard Device Configuration -> NVRAID Config - If you have a RAID configuration, enable it for each of the drives in the configuration, leave the rest disabled.
ODC - Enable the LAN boot ROM if you boot the computer through a network (which few people do unless they run a large network). If you have a sound card, disable the HD Audio, otherwise leave it enabled. For parallel and serial ports, leave at defaults if you use them, otherwise disable them.
Power:
APM Config - Most of these settings are up to you. Leave the HDD down in suspend feature disabled as you can do this in windows, and you dont want conflicts.
Hardware Monitor - Not sure what the Q-fan thing is, leave it disabled for the moment. I'll look it up and tell you if it needs to be enabled.
Boot:
Boot Device Priority - Usually you would set CDROM or Hard Disk first. Just tells the computer where to try and boot from first, second etc. If you want to reinstall windows, then you want CDROM first or it will keep booting your old installation from the HDD. Set floppy first only if you want to do a BIOS update etc. For the quickest boot time, set Hard Disk first. Disable any devices that you wont ever boot from (eg, LAN).
Removable Drives - If you have more than one Floppy or a ZIP drive etc., set the boot order for these devices here (floppy is best).
Hard Disk Drives - Whatever drive has windows on it, set it first, the others dont matter.
Boot Settings Config - You will probably know if your case is open so you dont need your system to tell you. Set Full Screen LOGO to disabled if you want to see the POST screen instead of the ASUS logo (I assume thats what it is) when you boot up. I like to personally, in case errors appear.
Security - If you can be bothered with BIOS passwords, and you think kids are gonna play with your BIOS, make a supervisor password. If you want to have a password entered every time you try to boot up and get into windows, enter a user password (since windows has this feature, its not really necessary). Password Check should be "Setup" if you want the supervisor password required, and "System" for the user password. Dunno how you can make it ask for both.
Tools:
ASUS EZ Flash 2 - A bios update program, but there are several ways to do it.
Exit:
You didnt do all that only to discard changes right?
Hope this helped, took me about an hour to do. Any questions, just ask.