For the installation on my laptop, where i have only one HDD with Win 7, the installer automatically detected my 64 GB free space and installed Ubuntu to this space and GRUB was properly setup for dualboot. (The first page of the installer already offered me the option to do so.) Now i want to install Ubuntu on my desktop PC where i have a slightly different setup: on my first HDD i have 320 GB where i have Win 7 installed. My second HDD (not partition!) of about 1 TB is split up into 896 GB for use in Windows (not another instance of Win 7!) and 128 GB free space where i want to install Ubuntu.
Will Ubiquity recognize Win 7 on my other HDD and install GRUB without problems, as i do not want to reinstall Windows ;)