Hello guys! 
So this is my first thread here in Tom's Hardware as I couldn't find any solution to my problem.
So a few months ago I bought a new laptop (ASUS R752L) with Windows 10 installed, it has 25GB SSD for the OS and 1TB HD for the other stuff. So when I bought it everything worked fine, meaning that I would only see my HD on ''This PC'' and everything that I would install would end up there (HD) taking no space at all from the SSD that was OS only. (So the OS was installed on the SSD and every windows update and every other app would automatically install on the HD drive which was letter C: and was the only one i could see in ''This PC'') Since then i have reformatted my PC and reinstalled Windows 10 and it works perfectly with all the drivers, BUT the problem is that when I reinstalled Windows 10, I did install it on the SSD (with 25GB) space but after that now it has barely any space left and I can see both the SSD and the HD on ''This PC'', so now i have very few space left on my SSD and I have to be very careful installing any programs that would use the /AppData/ Folder for example as it is located on the SSD but before it wasn't, only the core of the OS was installed on the SSD i think and now I can't even use Windows Update because I will run out of space.Although I install every program to the D: drive (1TB HD) their settings for example will automatically install on the SSD but before even with programs that wouldn't allow to change their installation path would automatically install on the HD.
This was when i bought the Laptop i few months ago, and it was setup like that which I would love to be like that again since I don't have to worry about apps saving their settings in the SSD or not being able to use Windows Update, before I could do all this and as I said before (because I want to make this very clear) even for the programs that changing the installation path wasn't an option they would automatically install on my HD and not SSD. Now I can't install any programs that don't have that option.
I can provide additional information if needed, sorry if it is a bit confusing but i couldn't find any solution on the Internet.
With respect Andy.

So this is my first thread here in Tom's Hardware as I couldn't find any solution to my problem.
So a few months ago I bought a new laptop (ASUS R752L) with Windows 10 installed, it has 25GB SSD for the OS and 1TB HD for the other stuff. So when I bought it everything worked fine, meaning that I would only see my HD on ''This PC'' and everything that I would install would end up there (HD) taking no space at all from the SSD that was OS only. (So the OS was installed on the SSD and every windows update and every other app would automatically install on the HD drive which was letter C: and was the only one i could see in ''This PC'') Since then i have reformatted my PC and reinstalled Windows 10 and it works perfectly with all the drivers, BUT the problem is that when I reinstalled Windows 10, I did install it on the SSD (with 25GB) space but after that now it has barely any space left and I can see both the SSD and the HD on ''This PC'', so now i have very few space left on my SSD and I have to be very careful installing any programs that would use the /AppData/ Folder for example as it is located on the SSD but before it wasn't, only the core of the OS was installed on the SSD i think and now I can't even use Windows Update because I will run out of space.Although I install every program to the D: drive (1TB HD) their settings for example will automatically install on the SSD but before even with programs that wouldn't allow to change their installation path would automatically install on the HD.
This was when i bought the Laptop i few months ago, and it was setup like that which I would love to be like that again since I don't have to worry about apps saving their settings in the SSD or not being able to use Windows Update, before I could do all this and as I said before (because I want to make this very clear) even for the programs that changing the installation path wasn't an option they would automatically install on my HD and not SSD. Now I can't install any programs that don't have that option.
I can provide additional information if needed, sorry if it is a bit confusing but i couldn't find any solution on the Internet.
With respect Andy.