You can download the Windows 7 Home Premium 64-bit w/SP1 ISO file from a link in the OP of the "Drivers. Apps, and How-to's" thread and burn it to a DVD to use for the install. Then you can install the more recent drivers needed for your hardware (links for the drivers are also in that OP). The difference being no ASUS applications are installed as in the ASUS Factory Restore.
If you choose the Windows clean install, I recommend using the ABR utility from a flash drive to backup your current Windows Activation info, then after you've had time to install the latest Windows Updates and confirm everything works as it should, you can then restore your original Activation info from the flash drive. Alternatively, there is an OEM license key you can use on a tag on the bottom of your laptop. This license is valid only for installing the Windows 7 version that originally came with your laptop.
http://rog.asus.com/forum/showthread.php?9082-New-notebook-Look-here! provides additional info on performing a clean Windows 7 installation.
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT