How to delete file which can't be deleted from windows?

• Click Start,
• Choose Run and type cmd,
• Again Choose Run and type taskmgr,
• Go to Processes tab and find explorer.exe and turn him off (mark him and click on End Process),
• Don't close Task Manager and go in command promt windows. Go to file which you can't delete and using commands cd for entry in file (cd program~1 or cd windows) and cd.. for exit from file (for example if we are in c:\windows\system32\ and we type cd.. you will exit in c:\windows\file)