"Another file has exclusive access to the file NTUSER.DAT"

I'm trying to download the Minecraft Launcher, but the message "Another file has exclusive access to the file NTUSER.DAT. Please shut down all other applications, then click retry." keeps popping up, and I closed the other apps and tried to get help from the Microsoft website, but nothing works and the message stays there. I was supposed to get Minecraft for my birthday but now it's months later and I'm sad.