Can't change installation folder

Hey, I have two disks on my computer, and my C:\ disk is completely overtaken by Windows 7, so I use D:\ for all my data, including the games. When I tried installing Sims 4, I changed the destination folder to D:\, and yet as soon as I tried installing it, I got an error that there's not enough space on C:\. I have ~4 GB still left there, while the game tried to put ~8 GB on it, but under the 'Required' space for D:\, I have 0 MB, as if the installer completely disregarded my directions.

Here, some screens of what it looks like.






Where does this issue come from and how do I fix it?

Oh, god, I think I screwed up. I did the alternative method, since my C: disk doesn't have enough space even if I cleared it up. I think I did everything right, and yet the installer still ignores the path I stated for it, but worst of all, I can't seem to fix it! When I try to run regedit again, the system acts like it's not in its place, and when I try to recover the system to the last point of save in time, the tool can't be opened. Is there any other way to run system recovery than through the administration panel?

Yes, I did the second thing and I think I messed up changing too many of the folders to D:, and now all the programs from C: can't be run. I'm gonna copy my data and try one thing with the registry. I'll tell you if it works