Thanks for trying to help & I tried a USB stick into the back of my router but it didn't make any difference. There were 2 USB ports & I tried them both. The XP Desktop is the main computer & was set up for the MFC before the laptops so the MFC software had no knowledge of Win7 and was behaving in the same way, so unless I've missed something I don't think that's the answer. The XP definitely 'wakes' the MFC & attempts to Scan & goes through all the motions but does not actually create the file (which of course does in some way correspond with what you said about not being able to Save the file). Anyway I have attached an error report if that is any help.