looks like you just need to get rid of the Windows.old folder and start downloading the games fresh again.
However, I would suggest finding all the save folder locations for your games and try to recover as many save files as you can that don't get backed up to the cloud automatically and then redownloaded when you install the game again.
However, I am going to assume you are on a desktop computer.
And that your current drive is an HDD.
What I would highly recommend is to get an SSD.
Something like 250GB is perfectly fine.
And then backup important files and data from your current drive to the cloud, then remove the drive from the system and install Windows clean to the SSD, then put the HDD back in the system and wipe it clean and download all your games again, but put them onto the HDD, that way from then on, if you ever need to do anything to your boot drive, your games won't be affected.
Possibly save data on the main drive, but games won't be harmed.
In fact, you can keep literally all important data on the HDD that way in the event that you need to do a clean wipe and install of Windows again on the SSD, you won't lose any important data because it's all on the HDD.
Just be sure that if you ever have more than one drive in a system, that when you go to install Windows onto a drive, that you disconnect all other drives so that Windows doesn't install it's MBR to a separate drive which becomes a pain in the butt if for example it installs the MBR to an HDD while the OS is on an SSD and that HDD craps out and you remove it to replace it, then the MBR is gone and you won't be able to boot into your OS if that happens. It's sucky.