Hello i have an ACER 5515 And for me to reset to Factory settings you have to enable it in BIOS.
Enable DND Recovery(Or not sure what it is called exactly) Then restart and press ALT-F10 During POST.
But this is to restore your laptop to factory settings basically re-installing your OS.
What exactly do you mean "Reset my hard drive"?
------------------------------HP Pavillion a819n Desktop: Pentium 4 HT 3.2 GHz | nVidia™ Geforce 6200 PCI 256MB | 2.5GB DDR | Maxtor 200GB | Win XP Pro
If I helped you, Select my post as best answer. I like to feel smart