Real easy. Download the iso from the site and burn it to a cd ( the file is small )
You use it to make your partitions b4 you install 7. And I always use it to mark the install partition active, that way windows doesn`t create the system reserved partition. Start off by deleting all the partitions so you have 1 empty drive, then create your partitions. Watch the video at the site, it shows you how to use Partition Wizard, very helpful.
You DO NOT NEED a System Reserved Partition. It will just waste a another use of a Primary Partition. Delete it during the install. Partition Wizard Bootable CD allows user to manage partition directly with partition manager bootable CD.
I would break your drive into 3 PRIMARY partitions of 300 GBs, 300 GBs and a 331 GB, as a 1 terabyte drive is actually only 931 Gigabytes. ( Just an example )
You could then store your data on the 2nd and put disk images on the 3rd.
You can always order recovery cd`s from the manufacturer in the future, if you ever want to put it back to factory condition. Yuk