During program writing, I tend to save a file often. Windows 7 seems to keep track of how often I do this and will soon tell me it is unable to save this latest version of a file I am working on. I will try to fool it by saving it to a different directory or folder but when I go to retrieve it, it cannot be found. I've never had these problems with XP or earlier versions of Windows. Also, when I copy a file from one drive to another, it tells me I need Admin permission to do this. I just click OK and it is done. I don't think I need to indicate I am the administrator of my machine since I am the only one to use it and there is only one password that is entered at sign in to this computer, mine. I see some of my saved files have a yellow lock symbol attached to them. What is that?