MyPadlock   
http://www.metaware-productions.com

Do youwant real internet security? Security you can see, security 'you' control. For text communication and file encryption get MyPadLock. Encryption keys are not random - you choose the keys to lock your information and you can change the keys as often as necessary. Keys are not saved in the secured information. If fact, your keys are not on your computer at all. They're in your head or wherever you wrote them down. If you received the following message in your inbox or as an instant message from a chat buddy, and if you were using the correct key, you could read this message: p@J\YYMm?IlBHSGS}OXGYMTBXLJxpXjpH@\ZYaOYYAV|HSSAIUOWa?KP@SXXqAK]ZZNn@JmCITHT~PYHZNUCYdHWQITNPNMSDbPU_IglXELJVUSJmCIDJC~XYXXOLZVaC So if you need more privacy in chat, instant messenger, email or sensitive file transfers then MyPadLock is your answer. It provides the locks and you provide the keys. - Secure your them with the keys of your choosing and give the keys to people you trust. When and if the need arises, change padlocks and keys. A new easy-to-use design in security that puts you in control.

IM Lock Professional Single User   
http://www.imterrupt.com

IM Lock controls and blocks access to Instant Messaging and peer to peer services that waste time and compromise computer security. Free trial version available - sets up in less than a minute. Blocks all popular services: MSN Messenger, Yahoo Messenger, ICQ, AIM, Skype, eMule, iTunes, and more. Have you wasted time, money and productivity coping with computer viruses, bugs and "malware" that your employees brought into the business from internet chatting, exchanging files online, or browsing the web? Say good-bye to the risks, stress and hassles of uncontrolled internet usage with IMLock Professional, a new product from Comvigo, Inc., an internet security company. IMLock Professional gives you control and peace of mind. IMLock Professional is quickly and easily installed directly onto your business's computer workstations to effectively block and control the most widely used instant messaging programs. You can also block popular peer-to-peer file sharing programs, and individual web sites. A simple password that you set gives you the ability to block access to chat, web sites and file sharing all of the time, or according to a schedule of your choosing. IMLock Professional is a complement to your company's existing Internet firewalls and anti-virus measures. Firewalls and anti-virus programs alone can't stop a persistent user who wants to chat, trade files, or visit disallowed web sites. Only IMLock can stop this waste and risk at the source - the user's computer. IMLock Professional runs on Windows XP, NT and 2000 computers. A single user license costs only $49.

WinLock   
http://www.crystaloffice.com

WinLock is a comprehensive security solution for personal or publicly accessible computers. It is a program that ensures that only authorized people can access sensitive information on your computer. With WinLock you can control how long others can use your computer. It runs from the system tray and requires a password to gain access to the available settings. It loads automatically with Windows and allows you to add an optional startup message, provide audio notification, and set the time limit. Once that limit is reached, Windows is summarily shut down. You can toggle the timer on and off from the tray. When enabled, there is no way around it without the proper password. WinLock also lets you to disable Windows hot keys (such as Alt-Ctrl-Del, Alt-Tab, Ctrl-Esc, etc.), lock Windows desktop, hide the Start button and Switch bar, lock files and folders, filter Internet content and much more...

WinLock Professional   
http://www.crystaloffice.com

WinLock is a comprehensive security solution for personal or publicly accessible computers. It is a program that ensures that only authorized people can access sensitive information on your computer. With WinLock you can control how long others can use your computer. It runs from the system tray and requires a password to gain access to the available settings. It loads automatically with Windows and allows you to add an optional startup message, provide audio notification, and set the time limit. Once that limit is reached, Windows is summarily shut down. You can toggle the timer on and off from the tray. When enabled, there is no way around it without the proper password. WinLock also lets you to disable Windows hot keys (such as Alt-Ctrl-Del, Alt-Tab, Ctrl-Esc, etc.), lock Windows desktop, hide the Start button and Switch bar, lock files and folders, filter Internet content and much more...

Password Lock Transparent Screensaver Utility   
http://www.e-motional.com

Password protect access to your computer, while monitoring programs that are running in the background. Perfect for system administrators, retail stores running computer demos, or any user of email, instant messaging or live stock quotes. Relax in the knowledge that your computer is secure.