Macbook Restore help PLEASE HELP!

[jack as]

i want to sell this macbook Apple MacBook 13.3" Laptop - MC240X/A (May, 2009)

And I want to install osx 10.7 Lion
But I dont have the disk.
Ive got the DMG file on my USB and I need help on how to restore it.

Also I have another problem. Ive partoined the macbook HDD to 130Gb to OSX and 30gb to Windows. When I try and delete it through Disk Utility It Wont delete. Please help

Note; The Macbook will only startup in Recovery Mode, So i cant access finder.

 

[oldscribe]

Hi and welcome,

I would create a USB boot stick if you have not already done so, then shut Mac down insert Stick and boot from that then do a secure erase and clean Lion install.