I tried to install iAtkos v7 on my computer with Windows 7 as the OS right now. The problem is, I can't get it to boot... So I recovered Windows 7 and went back to normal. My specs are:

HP Pavilion p6247c
AMD Athlon II X4 620 Processor @ 2.60GHz
6GB of RAM
Nvidia Geforce 9100 integrated graphics
Nvidia nForce 10/100 Mbps Ethernet

500GB HDD

How can I partition it correctly to make a dual-boot? Any help is greatly appreciated.