Thank you so much AbluMarlin! I signed up just because I wanted you to know that it worked and it was by far the EASIEST step to do (some blogs require creating admin account and deleting old one - which worked but I want the same desktop icons)!
I know that a virus I had affected my laptop so I wasn't able to change my background. I'm glad I finally decided to figure it out
Also, just to note, When I got to the folder "themes" I did not see any files. I had to unhide, hide, and then unhide again (odd I know) and then saw 2 files! I deleted the TranscodedWallpaper.jpg (which happened to be a picture of my last wallpaper), changed my theme and it worked instantly! =D If you don't mind, could you explain why that .jpg file needed to be deleted? Thank you so much!!