Windows Boot from Recovery Partition with ASUS UX31A?

Hi all,

I bought a UX31A last month, with Windows 7 Home. A few days ago, I upgraded to Windows 8 Pro.

When upgrading, I deleted all partitiions EXCEPT for the 10GB Recovery partition.

However, now I have decided that Windows 8 is a bit too buggy at the moment with this machine, so I want to go back to the Windows 7 Home setup that came with the machine originally. However I am unable access the ASUS Recovery partition in order to return the machine to the factory state.

I have tried to press F9 on startup, as per the the instructions on the ASUS website (link below), but nothing happens. However, the partition is still definitely there -- I have checked using the Computer Management tools on Windows, and the 10GB partition is indicated as "Healthy". For some reason I cannot access and boot up with the all-important partition on startup.

How can I see the option of booting with the Recovery Partition, and thereby reverting back to Windows 7?

Many thanks

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Link to the ASUS page for the UX31A (note that my machine doesn't have an optical drive):
ASUSTeK Computer Inc. -Support- Troubleshooting UX31A