is there a free software capable of saving data files to DVD?

i want to have a free software to do backup for all my data files in my computer to a DVD disc. The total size is less than one gigabyte. is there such a software? Thanks a lot in advance.
I’ve tried to download nero trial version, but I can’t install it after download. What’s the reason?
can the window media player save data files, such as word files onto DVD?