TriggerFinger

if F11 does not work, you may not have a recovery partition.

are you using the harddrive that came with the laptop? if so, could you recall if harddrive was formatted before? if somehow, the recovery partition was deleted then you may need to order a recovery CD from HP/Compaq.

the recovery CD will install your operating system back to factory defaults (yes, including all the trial and other software that came with it).