cannot delete files on 10.7.5

Hi everybody!

Every time i'm trying to delete a folder or a file, finder prompts for my user password and the file/folder disappears but it doesn't go in trash and the space is not freed up from the hd.
I tried with verify/repair disk permissions but it didn't help.
I didn't make any changes before this, everything worked normal.

 

fixed

fixed with this:

1. Reboot the computer.
2. Login with the troubled user account
3. Open 'Terminal'
4. Type:

sudo rm -frv ~/.Trash

Note: This removes the old ".Trash" directory and all files and folders in it.

3. Type:

mkdir -v ~/.Trash

Note: This creates a new ".Trash" directory in your home folder.

4. Type:

killall Finder

Note: This kills/restarts Finder

5. Close Terminal.

6. Reboot Computer.

Thank you!