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It's not accessed with an "Fn" key combo, but with an 'F' key.
I found this on an Averatec support page so hopefully it's correct:
"Your machine is equipped with the Phoenix Recovery program built into the hard drive. Upon booting up the unit, press the F4
button to enter the recovery program and follow the on-screen instructions".
(Be aware that you must press F4 at the correct time, that is to say, during the initial boot process after switching on).
Edited by phillipcorcoran, 12 February 2011 - 03:08 PM.