After a fresh install of Windows on a SSD, here is some tips which permit to earn some disk space and permit to not voids the warranty.
First, disable the hibernate mode (by using the command prompt) :
powercfg -h off
Next, reduce or disable the virtual memory (which is equal to your amount of RAM !) by following these steps.
These two tips permit to free up a lot of drive space (20GB on my configuration !).