Hi,
Just did this myself yesterday, very simple:
1: In Snow Leopard, go to Disk Utility, create a 2nd partition and format it to FAT and rename it to something like Win7
2: Install Win7 via USB Pen to the Win7 partition
After Win7 is installed, at your reboot, Win7 will be the only OS, to fix this do the following:
In Win7
- Open "Run" and type "cmd"
- type "diskpart"
- type "select disk 0"
- type "list partition"
- type "select partition X", where X is the number of HFS+ partition (large size + offset 200MB)
- type "active"
- type "exit"
- Unplug ALL the removable drives
- Plug in the USB pen which you used to install Snow Leopard and boot from this USB pen
- in the boot selection screen select OSX
- Once in OSX run the latest version of NetBookInstaller, and select to install the bootloader. (You can select the other options too if you require them, but make sure you DO NOT select Enable Quite Boot)
After this is installed, when you reboot you will get a selection screen, use the left/right arrow keys to select OSX or Win7
The above instructions has been slight adapted from this thread, and I do not take any credid for it:
Simple way to create Dual Boot : Snow Leopard and Windows 7
Kimmy