|Does someone else use this same computer?|
If so, did they use it after you logged out and before you attempted to log in again the next day?
"My name as administrator is there"
There is always an Administrator user in XP and 2000 under C:\Documents and Settings. Your account may have (had) administrator priviledges, but that's not your user account unless there is at least one other user and you were only using that Administrator account, in Safe mode. Windows won't allow you to name your specific user as Administrator or administrator.
".... my dokuments, pictures etc is gone. I found them again on the hard disk, but they are not in my account."
The Administrator user, Default User, and any other users of the computer besides yourself all start out with having the same subfolders, but the contents of those folders are not the same once the computer has been used some - e.g. it's not your own documents that are listed under My Documents in those.
If your user account is corrupted, when you attempted to log on to the user account you normally use, you would have gotten a message Windows cannot log onto the user account and is loading a default user, or similar. In that case your user account name (other than Administrator) is still there in C:\Documents and Settings, and it still has all of it's subfolders specific to that user. That can be recovered from.
If someone has deleted your user account, there will be nothing for it listed under C:\Documents and Settings, including the user name.
All the things that were there will not show up in the Recycle bin - the locations of where that data was has been flagged as available for any new data. If you use Outlook or Outlook Express, your personal data for that was stored there by default and has been deleted.
If you want to recover any of that data, you must use an un-delete pgram or similar to recover it as soon as you can - the longer you wait, the less data you will be able to recover, because Windows will have over-written the location of where the data waswith new data.
If your specific user name, other than Administrator, is still there under C:\DocumentsandSettings, but it has no subfolders, either your data on the hard drive is damaged, and/or the hard drive is failing.
Try running chkdsk.
Start - Run - type: cmd (click OK or press Enter)
type: chkdsk /f c: (press Enter)
(a space between chkdsk and/f, and /f and c:)
Answer Y (press Enter) when it asks a question.
Close the black cmd mode window, by typing: exit (press Enter), or by clicking on the large X top right in the window.
Reboot the computer.
Let Chkdsk run - don't press any keys after the blue screen messages about chdsk wanting to run appears.
Check your hard drive with the manufacturer's diagnostics.
See the latter part of response 1 in this:
(thanks to Dan Penny for this link:)
Hard Drive Diagnostics Tools and Utilities
If you don't have a floppy drive, you can get a CD image diagnostic utility from most hard drive manufacturer's web sites, but obviously you would need to make a burned CD, preferably a CD-R for best compatibilty, on another computer if you need to.
If the hard drive itself tests okay, any data problems found can be fixed, one way or another.