Install windows 7 on a MAC BUT the disk is already formated

Hello guys
I need your help
I have an older mac that was given to me..
the problem was that it was stuck! it would load and go on the background screen and then.. the only thing you could do was move around the mouse and when you clicked something..(anything)..nothing would happen..
SO
i literary took out the hard drive > formatted it into NTFS > and put it back in the MAC > thennnnnn i was planning to....
insert a usb or a CD with windows 7..and simply install windows on the mac..

BUT..(there is always a BUT)

when i turned on the MAC with the CD & USB already in the mac..the mac would go into a white screen with a flashing rectangular shape with a quastionmark in it...


SO my question is..how can i install Windows 7 on this MAC having a formatted/empty drive? i do not have MAC operating system CD or something..just a CD/USB with windows 7

Any help is appreciated

 

Thanks for the prompt reply
I was afraid that this was the only solution.. :/

ok then..can you guide me how to do that?
(i am a bit clueless when it comes to macs)
to be honest i would prefer having this working as mac rather than a PC..

This is a rather old MAC..and as informed from the previous owner it used to have tiger OS..(been told that lion could not be supported)
So i need to do a fresh install of tiger OS..
emmmm..HOW?
can i download them somehow?

AGAIN THANKS A LOT

 

ok i think i got it..thanks
will try and install tomorrow..
i wil llet you know how it goes..

i suppose the installation DVD will boot automatically as soon as i turn on the MAc yeah? and then guide me through the process

 

ok..will do