If they are faded they are hidden or system files and you shouldn't really even be able to see them, you must have your system set to show hidden and system files, this is not a good idea for day to day use!
I personally wouldn't delete them unless you are critically low on hard drive space, I would also suggest turning of "view hidden and system files"
open my computer, click on the tools menu, select folder options and then click on the view tab, look down the list and put a tick in the option that says "do not show hidden and system files"