Quite a stupid mistake. I was going through my registry and accidentally deleted the entire winlogon folder under HKEY_CURRENT_USER\Software\Microsoft\Windows NT\ and now when I start up the computer, a screen comes up asking me to log on (it never did this before, it would just finish booting by itself). I can log on either as my default username, or as administrator, neither of which require passwords since I never set any, but in both cases I am automatically logged back out within a couple of seconds. My wallpaper loads, but nothing more. I'm using Windows XP Pro with SP2 and all Microsoft updates, on an Asus Z96J notebook. I've looked all over for something that would help me undelete a registry key without having to actually get into Windows, but so far I haven't found anything. Even if I have to reformat, any ideas on how I could recover some of the files before I do that? I tried using the Windows CD and going through the repair process, but the "copy" function won't let me have access to any of the files on my desktop. Any help at all is really, really appreciated!