I just bought a brand new laptop and now I can't save anything to the main storage drives?

I just bought a brand new Asus Vivobook f510ua, with a 128gb m.2 nvme SSD and a 1tb HDD. The C drive is the SSD and the D drive is the HDD. As soon as I got it set up, I installed Avast on the D drive, and after that it wouldn't let me save anything to the same D drive but would ask me if I wanted to save it in my account's folder. So I uninstalled Avast with Avast's uninstaller tool, and now it still won't let me save anything to the C or D drives, but still asks me if I want to save it to my account folder. Any help is greatly appreciated.