This may help you:
http://h10025.www1.hp.com/ewfrf/wc/d...name=c00608578
You need to tap F11 to get the HP PC Recovery
I would recommend reading the link as you may loose all your Data.
If you have had issues this may apply:
http://h20000.www2.hp.com/bizsupport...ctID=c01087277
Bill