I have a laptop and a PC and they are on a shared network. I want to take what I've downloaded on the laptop to the main PC but when I try to move the files it pops up with a message:

Cannot copy "x": Access is denied.

Make sure the disk is not full or write-protected
and that the file is not currently in use.

How would I fix that? I know it isn't just the PC because it doesn't work on other computers either, and I have access between the computers because some of the files will transfer.