How would I go about replacing Windows 7 with OS X? I currently dual boot Windows 7 and Ubuntu and I would prefer to just have OS X instead of Windows. I have an iAtkos 10.5.7 disc, but if you could explain how to for newer versions I would appreciate it.

These are my specs:

Intel Celeron CPU EE300 @ 2.5GHz
Nvidia Geforce 9500 GT
2G Ram