Dropbox has synched all of my files onto my hard drive and now my available disk space is critically low. I've tried moving the files to an external drive but the files all have a grey X on them and when I try to move them I get an error message:
"An unexpected error is keeping you from moving the file. If you continue to receive this error, you can use the error code to search for help with problem"
Error 0x80070780: The file cannot be accessed by the system.
Help!