Ok,

I am not the best at this but I'll recommend you download gparted live and burn it to a CD,Once you install iatkos it will mean you can temporarily no longer boot into windows,If you boot into the gparted live CD and select default setting and then your language clicking the Gparted Icon and right click your windows partition will allow you to manage flags,set this to boot,Then put in your windows 7 install CD and repair it,After this boot into windows and check everything is OK,Then re insert the gparted disk and set the mac partition as boot flag.This will mean your PC will boot into Chameleon(if you chose it) and allow you to select your OS.

I am as we speak repairing my windows for a second time cause I made a mistake installing iATKOS V7 :P ,I've posted on a thread that matches my machine and hopefully it'll be up and running soon