Hello njonjo Welcome to the Seven Forums!
I think you misread what is being shown there. The 232gb is the total available drive space for a 250gb drive. Now deduct the space taken by the Windows installation, system restore points including drive space reserved for those as well as the paging file, and then add all programs installed so far.
The 205gb figure is listed under "drive capacity" not free space available which shows some 81.71gb is the actual amount of drive space free roughly 40% of the total out of the 205gb figure. Some 27gb is being reserved by the system for the installation itself along with the programs installed, restore points, paging file explaining why the capacity is being seen as 205gb and not the full 232gb.