Access Boss allows you to restrict computer access for specified users. You can limit access by day of the week and time of day, and/or set a maximum work time limit per user. If the user attempts to logon during restricted times, he/she will receive a notice dialog instead. If a maximum work limit has been reached, the user can be logged off or the computer shut down - both with an optional grace period. Additional features include statistics, network support and more.
Features and benefits:
Easiest way to control computer time
Limits time when a user can/cannot logon your computer
Limits for how long a user can use your computer
Automatically closes user's session when the time is out
User Notifier displays remaining time and warns when time is about out
Records user statistics
Remote computer management
Password protection
Security options to protect Access Boss settings from unauthorized access
Why Access Boss is better then standard Windows time limit control tools
Probably you know that Windows NT based operating system allow you to limit time for each users. However it is only possible to limit time when users can log on. If the allowed log on time is over but user have already logged on, there is no way to force the user off. There is no way to set duration time limit and time interval is limited by 1 hour. Unlike Windows, Access Boss forces users off, has duration limits and 15-minute time slot. Some editions of Windows Vista comes with Parental Control facility, but the time interval is still limited by 1 hour.
Extremely easy to limit computer time
Access Boss is very easy-to-use software. It can help you to perform difficult administrative operations with easiness. All you have to do is install Access Boss on machine under administrative account, run the software and choose which users' access time should be restricted. To do so you simply mark the required hour(s) of any day of the week as either 'allow' or 'deny'. It is all that simple! Once you apply the changes user access restrictions will take effect.
Access Boss features extensive set of security options, including password protected software access and remote workstation administering.
Access Boss offers very flexible option to limit or restrict user logon hours in your network. It allows you to limit or restrict logon time on remote Windows computers as well as on local computer. Importantly, the software comes with password protection, guaranteeing that time restrictions can not be overridden or bypassed.
Access Boss User Notifier
Access Boss User Notifier is a special software module that runs in the system tray and displays the remaining time. It warns when the user time is about out with a short message and sound effect. It helps users to avoid unexpected data loss when Restriction Service closes their sessions.
User Shell Restrictions
With Access Boss you can set security restrictions for each user. All these user restrictions can be tweaked with Windows Registry Editor. However, Access Boss gives you more handy user interface.
Disable Task Manager - Disables Windows Task Manager. Although it is impossible to detect Access Boss Agent with Windows task manager or other process viewer, you may take benefit from this option if you have another program you don't want to be detected and killed.
Disable Registry Editor - Disables Regedit.
Disable Display Properties - Prohibits user to change Windows themes, desktop and screen saver settings and tune the display properties.
Disable Internet Properties - Prohibits user to change Internet Explorer settings.
Disable Command Line - Disables Windows Command Prompt.
Disable Control Panel Applets - Prohibits user to open Control Panel or start any CPL files.
Disable Desktop - Removes all desktop icons.
Disable Taskbar Properties - Disables taskbar and start menu properties.
Disable Search item in Start menu - Removes Search from Windows Start menu and disables Win+F key.
Disable Run item in Start menu - Removes Run from Windows Start menu and disables Win+R key.
Disable Recent Docs in Start menu - Removes My Recent Documents from Windows Start menu.
Disable All Programs - Removes All Programs from Windows Start menu. This option works only if XP style menu is enabled. It has no effect if Classic Start menu is in use.
Disable Start menu modifications - Prohibits user to change start menu items.
Disable Network Places in Start menu - removes My Network Places from Start menu.
Disable Computers Near Me - removes Computers Near Me in My Network Places.
Block Access to drives - Tick the drive letters that will be inaccessible for the user. The drives will be blocked from Windows Explorer and Explorer-based applications. However they may be accessible by some not Explorer-based programs.
With this security restrictions you can create a limited working environment for your users.

The license of this software is Free Trial Software, the price is $24.95, you can free download and get a free trial before you buy. If you want to get a full or nolimited version of Access Boss, you can buy this system locking software software.