Error code INST-14-1618

before you start, yes i've read other forums about this issue. Mine is different. I've redownloaded the sims numerous times, each time I left the actual files alone, I just deleted the mods and the app itself. Now, I wanted an entirely fresh start, which led me to mess up entirely. All I know is, on the C:/ file thing, the EA Games folder is still there, but when I click on it there's nothing inside. I'm assuming that this means I need to do something, and every time I try to redownload the app it gives me that error code. Please help! Ive added an attatchment that tells me some tricks I can do but im not very tech savvy so i'm not sure how to do it.