So a friend's PC has a virus that we can't get rid of, so I'm planning to re-format the hard drive and re-build it from scratch.
Its running Windows XP SP3, and they have iTunes with a whole load of music that they bought from the iTunes store. Some of it, I think, was bought in the days when iTunes still applied DRM to the music files.
Once I have re-built the PC and copied the music back on, I want to make sure the music still plays.
Presumably just copying the iTunes library to an external drive is not enough
What do I have to do to make sure DRM music will still play after re-building the machine? Is there some sort of official iTunes backup method to handle this?
edit: Also, how can I tell whether music in the iTunes library is DRM'd or not?