Recovery from recovery disk not possible



System: Vista Business OEM pre-instaled on my laptop.
I have a recovery files on my external HDD (whole system). In help file to
it says to press F8 while booting, select "Repair computer" and follow
instructons ...
On my advanced startup menu THERE IS NOT such option !!! What now? My systm
bacup is useless?. I don't have full Vista instalation disk, just Recovery CD
of pre installed system which allows only to recover to factory installed
system.
.