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#11
You cannot use Factory restore if you clean reinstall Win7. The recovery partition will be disabled by the new installation. Make the recovery disks to keep in case you ever want to factory restore for resale, or as is sometimes required for hardware replacement under warranty.
Instead save a Win7 backup image to a primary partition which can be used to reimage the HD by booting from the Win7 DVD or a repair CD you can make in the backup center.
If you want to have this available using a F-key, then wipe the HD before installing Win7 and it will assign a 100mb boot/repair partition which will make the Recovery tools available at F8 during bootup. Select "Recover using an Image" to trigger reinstall of the Backup image you have stored in a primary formatted partition, or in the root of an external drive.