Can't install mac os x on macbook pro anymore(now i have windows 7 on it)

Hi,
I have a macbook pro, there was mac os x 10.6.4 on it, after that I installed windows 7 on it, because i wanted a clean instal, but I couldn't because a kernel panic when i booted from the dvd mac os x 10.5(that I received when i bought the macbook pro), I also have a 10.6 snow leopard dvd. So I installed windows 7.
Now I can't install mac os x because of the kernel panic, I also tried a lot of dvd that i borrowed from friends, and I also bought a new mac os x snow leopard dvd ...
the error is just: you need to restart your computer.....
I tried also some key combinations on startup like: Command-Option-P-R keys,Command-Option-O-F,startup from dvd: pressing C on startup, pressing D on startup,pressing option on startup.
I searched evrywhere but didnt found a solution
Nothing helped so can someone help me please?
Now i have just a windows 7, i realy want mac os x back, its a lot easier in the class...
PS: I am a noob, so dont explain it hard please

You are just throwing things that have no bearing and can cause trouble, there is no Open Firmware, Intel based Macs use EFI, OF was part of the older G4/G5 and PowerMacs.
Unplug everything but keyboard and boot from 10.6 DVD.
Boot from Windows 7 DVD if you want and instead of installing, format the entire hard drive as NTFS and then try OS X DVD.
But first and foremost.... where is your backups? do you have OS X on external drive? how about putting OS X on external hard drive?
And you're sure this is a kernel panic? a prohibitory sign maybe?

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