Generally, a standard user can use the computer with restrictions: it does not have access to the administrator's folders or of other users, it can not install or uninstall programs, it can not add new users, it can modify a very limited set of settings (mainly related to his account, for example, the combinations of colors, or the icons), it can not install new hardware, it can't access the registry, it doesn't have access to the protected system folders, etc.