Installing on machine with multiple partitions already

Hi, I am completely new to Linux and a non-techy home user of windows, and am just about to install Zorin alongside windows 7. It is a clean machine, recently factory reset with four partitions is already on it. This is where my question comes in. The first two are the Windows system and the windows image . The next is a 100 GB partition that windows saves files to by default. and the next partition is a 350 GB partition. So is the instruction to leave room for windows still valid? Or do I get a choice during install on which partition Zorin will be installed? Also, when it comes to deciding the partition sizes, this depends on whether I would be able to have a partition which contains all files saved by both Windows and Zorin that they can both read and write to ? Or whether I would have to use a portable HDD? I have read that Zorin can read and write to NTFS. I would appreciate some advice please, thanks.

Whether you can install Zorin on your current setup would depend on how many of your existing partitions are 'Primary' - the maximum is 4.

How to do it properly is in my video here:

https://vimeo.com/110085401

If having difficulties, make free space, create an extended partition and create the three partitions you need inside of that - '/', /home, swap area