Media refers to cds you may have used, for example, one that came with your printer to load & install, a program, for example System Mechanic, or restore disc that came with the computer, anything that is for reading, & not music is referred to as media.
Windows Media Player could possibly be the problem, as all of the info was just transferred from an older Gateway to this newer one, & they have not gotten all of the bugs out of 7 yet, as I see many roadblocks with other people that have aquired 7.
This will play both commercial & homemade music cds, will not load media.
The older pc accepted both.