let me tell you this, what my lil plan is.... (if you or somebody else could help me out)

im going to buy a new (second) harddisk so i could easily dualboot.

when i get that harddisk deliverd, i hope somebody can help me, to set up those 2 harddisk, so i could run dualboot, and i also hope somebody could help me to install leopard osx, and windows 7.

thnx, i hope you people understand, because my english isnt good... too bad

Any SATA hard-drive is OK, 500gb is nice size

Like I say I would just disconnect your windows drive and follow a guide for your motherboard, you do the partitioning of your OSX HD during the install process (with disk utility) - a good tip is to have a backup partition for when you mess up your install.

Yeah i have a externel harddisk, where all my back up data is.
If i have to format botch internal harddisks its no problem for me.

Thank you for the wonderful guide, the installation went very well. My installation works fine without having to install the addition files in step ten, should I still do it and what is in those files anyway?

I have an HP HDX16t 1200 with Intel Core2Duo T6600 CPU, Geforce 130M 1GB and that is all I can tell you while I am at work.

Thank You in advance