Hi Dumbk1tty -
I'm Jerico T., one of the Independent Advisor and a fellow Windows 10 user like you. I understand that you're having some issues right now, let us sort things out.
If you are referring to your hard disk drive, you cannot buy any additional storage space because a hard drive have fixed storage capacity. There are two options for you to have more storage space on your computer.
Option 1: Purchase larger storage hard disk for your laptop.
Option 2: Purchase external hard drive for your games.
Note: If you will save your game progress on external hard drive, there might be some cases that it won't work or in worst case, the save game progress will get corrupted.
Feel free to reach us back if you need further assistance.
Hope this help. Have a good day.
Thank you.
Jerico T.
Independent Advisor