Well, if you can get to Windows download the HP Recovery Manager and create the recovery disks. The disks have exactly the same purpose like pressing F11 but from a different media (DVDs).
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?cc=us&lc=en&dlc=en&softwareitem=ob-75985-1
But in my opinion you will have to fix the bootloader using that Windows disc anyway.