Messenger Popup Blocker Free Edition
Messenger is a service that comes with Windows XP, NT, and 2000. Advertisers have taken advantage of this by sending ads over this service. Messenger Pop-up Blocker is a free program that blocks 'messenger pop-ups' from appearing on your desktop. It does not block other pop-up ads while surfing... Messenger Popup Blocker does not in any way disable you from instant messaging (AIM, MSN Messenger, ICQ).
http://www.capehostpro.com/downloads/messenger.exe - 261Kb - Download - Screenshot

Pop up Blocker
Pop Up Blocker has four types of pop-up blocking: 100 percent pop-up blocking, a block list, a block list with keywords, and a limit on the number of open windows. Pop up Blocker also blocks Flash Ads, Background sounds, Inline videos, JAVA Applets and Animated gif files. ... This program is packed with advanced privacy-protection technologies, which prevent your home page from being reset, protect your proxy settings, provide a sound effect upon closing pop-ups, disable auto suggesting, and block messenger-spam pop-up ads.
http://www.synergeticsoft.com/files/pb6.0.5.exe - 534Kb - Download - Screenshot

IMMonitor Yahoo Messenger Spy
IMMonitor Yahoo Messenger Spy allow you to monitor, block or record Yahoo Messenger conversations remotely, If your kids (or spouse! ) are spending too much time chatting via Yahoo Messenger, or you suspect they're engaged in dangerous conversations, IMMonitor Yahoo Messenger Spy is a very... No one will know how their Yahoo Messenger conversations is being blocked or recorded and it will never stop working until you close it. ... You can save all intercepted messages to HTML files for later processing.
http://www.immonitor.com/download/yahoochecker.exe - 1Mb - Download - Screenshot

Messenger Spam Block
In order for you to be able to easily stop messenger spam pop-ups from appearing on your computer, we developed a small free utility: Messenger Spam Filter. Windows, by default, leaves the messaging service active upon installation. Once deactivated, the messenger spam can no longer invade your... Messenger Spam Filter allows temporarily deactivating or permanently disabling the Messenger service, Messenger Spam Filter temporarily deactivates or permanently disables the Messenger service, protecting you from annoying Messenger pop-up windows.
http://www.spamliquidator.com/files/messenger-spam-block.exe - 248Kb - Download - Screenshot

Host Security Personal
Host Security Personal(HSP) not only password-protects files and folders, it also protects you from hacker attacks when you surfing the Internet. HSP allows you to specify which websites or IP addresses can be accessed so can be used to block unhealthy websites. ... Messenger, ICQ, and AOL Instant Messenger. ... It can also block popular instant messengers, such as MSN Messenger, Yahoo! ... It supports FAT/FAT32/NTFS and works under Windows 2000/XP. ... HSP also restricts uses of local hard disks, CD-ROM drives, floppy drives, and removable disk drives so without your permissions...
http://www.y0ys.com/exe/hspsetup.exe - 854Kb - Download - Screenshot

Message Shield
Message shield will block those annoying messenger popups for good. One click and your messenger popup problems are over. Does not intefer with your ability to use any messenger program.
http://dl.filekicker.com/send/file/135931-PAKM/messageshield.exe - 98Kb - Download - Screenshot

Safe Chat w/Parental Controls
Safe Chat Universal Messenger with Parental Controls is a universal instant messenger that support MSN messenger, Yahoo messenger, AIM (AOL) and ICQ network. The parental controls features let the parents control who can chat with their children, when their children can chat online. ... Once Safe Chat is installed it will block other messengers from being launch. ... Safe Chat block web based chat sites so that children can not go on to unwanted sites and chat. ... The only approved browser that the child can use is the Internet Explorer that come standard with Windows.
http://www.zihtec.com/download/SafeChat.exe - 4Mb - Download - Screenshot

Pop up Blocker Pro
Pop up Blocker Pro is an aggressive pop-up blocker. The pop-up blocker has 4 types of pop-ups blocking: 100% pop-ups blocking, Pop-ups Block list, Pop-ups Block list with keywords, Limit windows opened. This is one program packed with advanced Privacy Protection Technologies (Prevent your home... With Pop up Blocker Pro you can surf the Web with complete peace-of-mind, knowing that Pop up Blocker Pro protects you from unwanted data becoming permanently hidden in your PC, without the possibility to recover it.
http://www.synergeticsoft.com/files/PBpro.exe - 657Kb - Download - Screenshot

IP Messenger Spam Blocker
Simple one-click to complete protection against Messenger pop-up ads! IP Messenger Spam Blocker prevents IP messages from appearing on your machine. One click and your system is automatically protected. Direct IP messaging is the newest form of advertising spam. ... Block all IP Message Spam - Download IP Messenger Spam Blocker Invisible Browsing will also protect you by blocking ActiveX controls which can harbor malicious code such as viruses and invasive code such as JavaScript. ... Invisible Browsing allows you to connect your entire home or small office network to the same Internet...
http://www.amplusnet.com/setups/ipspamblocker.exe - 441Kb - Download - Screenshot

Popup Killer
Popup Killer is used for stopping all annoying pop-up ads windows when you surf the internet. It also blocks Windows Messenger in Windows XP/2000/NT which interfere with your program running. It is easy-use tool without any configuration. It runs automatically when Windows starts up each time,... Block Messenger popup spams for Windows XP/2000/NT. ... The main features include: Block unsolicited pop-up ads. ... Robust and never make IE crash or frozen. ... Easy to use without need any configuration.
http://www.008soft.com/products/PopupKiller.exe - 376Kb - Download - Screenshot