Take the computer to a shop, get them to pull all your files off the disk so they are not lost, and reinstall Windows. In that order. If that is not an option, we may be able to help with grabbing your documents/files/etc and reinstalling Windows, provided you have access to another computer & can download files from the internet.
I would normally recommend doing it yourself with a live Linux distro and Windows disk as its a good learning experience, but not sure that would be the best option in this particular case.
Actually I'm turning 12 on the 28th
I'm also a programmer, but I'm still very new to it
Do you have access to another computer with administrator access to download a fairly large file and create a live flash drive? Do you have a Windows disk on hand, and do you have a portable hard drive or the like that you could copy all your files to?
Oh god, looking at this old thread I made when I was 11 lol, 4 years later and this is literally so easy to fix I could do it in 5 mins (not including the install time of course, just the initialization.) lol I didn't know anything, xD (sorry for old thread bump, I just looked at this and was like "OH GAWD")