hi i have r4i 1.4v upgrade revolution for ds card and a 4gb memory card which was working fine then started to freeze so i decided to change some of my games as there was some i was not using and now it comes up with the memory card with a sad face and menu? underneath it what is the problem with it that i cant get it to work in my ds but i can get the memory card to work in the computer. please help as im missing some of the games i have been playing