OK, well obviously I didn't describe what I meant in the first place.
Original Text: " If the file is in use, you might try to copy the files by using MS-DOS "
What I did mean is that if you exit Windows, then go into the command prompt (MS-DOS), you would have most likely exited the program that is using the file. This would allow you to copy the file, because it wouldn't be in use at the time. Windows XP isn't that great for the command prompt.