Every user account in Windows has its own image. Using this image users can easily find their accounts and it enhances user account look. This picture will appear on screens or menus that display their user name, such as the Welcome screen and Start menu.
A user account in Windows is a set of settings that tells Windows which files and folders user can access, personal preferences, such as desktop background, screen saver and theme. User accounts let you share a computer with several people, while having your own files and settings.
Guest account is uses to access Windows system by the people who do not have an account to log on to the computer. This user account is creates while installing Windows operating system and allows people to have temporary access to your computer.
In Windows systems, specially Windows Vista, sometimes we encounter with problem of not responding applications. This can also happens with Windows Explorer. If an application is not responding than it is very difficult to end or kill that process or application.