It's quite uncommon to save anything in the root folder. That's kind of a special folder, and that might be one of the reasons.
First use File Explorer to create folders on that drive, and see if you can copy some file from the c:-drive to such a folder. If that works, repeat the download. Does it work now?
I have just got my new laptop for which I upgraded to 240GB SSD (C drive) and currently the OS is running on the SSD. The laptop originally come with 1TB HDD (D drive). I tried to download files from the net and wanted to save it to the D drive, but the system says that i am not allowed to save to that location. Is it the windows problem or the browser (chrome) problem? How to solve this? Thank you.