Windows Vista Product Red was produced as part of the Product Red program, with a portion of sales supporting The Global Fund to Fight AIDS, Tuberculosis and Malaria. The edition was originally distributed as pre-loaded software on a line of Product Red-branded Dell PCs, but was later released at retail. Besides including an additional desktop theme with wallpapers and other content, it is otherwise identical to the main Windows Vista Ultimate SKU.
This ISO requires Windows Vista Ultimate to be present on the machine where you run the Product Red ISO.