Hello, I have an Acer Aspire One D255 (windows 7 ultimate) I have a problem. Why is it that whenever I change my desktop backgound and after shutting it down, the background was not what I chose? And i downloaded files (for example AIMP3 and some music files) and ALSO after shutting it down, all downloaded files and copied files were missing? It ALWAYS GOES LIKE THAT. HELP ME PLEASE