Factory image on seperate partition (D:)?

I have sold my HP PC Windows 7.
Trying to clean up the C: disk to have data and personals gone, I got stuck.
How to use the Factory Image seperate partition to put my PC back to its fresh start position?

Mark O2011-12-01T15:58:08Z

Favorite Answer

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01895783&tmp_task=solveCategory&cc=us&dlc=en&lang=en&lc=en&product=3860630

Instructions on how to recvoer from the recovery manager factory settings
pressing f11 at boot

?2016-11-19T09:52:38Z

precise click on my computing gadget, cilck on handle click on disk administration, precise click on the the parition, then click delete, if the parition is utilized via the equipment, swap to a distinctive parition first...

Joe2011-12-01T15:47:24Z

?????????????