Disable the QoS Packet Scheduler
2.1 For Windows XP:
2.1.a. Click Start, and then click Control Panel.
2.1.b. Click Network and Internet connections, and then click Network Connections.
2.1.c. Under LAN or High-Speed Internet, select the Local Area Connection that has a status of Connected.
2.1.d. Right-click that connection and then click Properties.
2.1.e. Clear the QoS Packet Scheduler check box.
2.1.f. Click OK to save the changes and close the window.
2.2 For Windows Vista:3. Remove Third Party Applications
2.2.a. Click Start Pearl, type Network and Sharing Center in the Start Search box, and then press ENTER.
2.2.b. Click Manage network connections.
2.2.c. Under LAN or High-Speed Internet, select the Local Area Connection that has a status of Connected.
2.2.d. Right-click that connection, and then click Properties.
2.2.e. Clear the QoS Packet Scheduler check box.
2.2.f. Click OK to save the changes and close the window.
Look for any of the following: MyWebSearch Toolbar, Smiley Central, Messenger Plus, Kiwee Toolbar, Info Pen or MacroGaming SweetIM installed in your computer. These might be integrated with the Messenger but are actually third party add-ons which Microsoft did not author nor test and have been observed to cause conflicts with the Messenger program. If you have them installed, uninstall them.
3.1Windows Vista:
3.1.a. Click Start, type Control Appwiz.cpl in the Start Search box, and then press ENTER.
3.1.b. In the list of installed programs, search for any third-party toolbars, such as MyWebSearch Toolbar, Smiley Central, Messenger Plus, Kiwee Toolbar, Info Pen or MacroGaming SweetIM and then uninstall the program.
3.1.c. Restart the computer.
3.2Windows XP
3.2.a. Click Start, click Run, type Control Appwiz.cpl in the Open box, and then press ENTER to open the Add or Remove Programs item.
3.2.b. In the list of installed programs, search for any third-party toolbars, such as MyWebSearch Toolbar, Smiley Central, Messenger Plus, Kiwee Toolbar, Info Pen or MacroGaming SweetIM and then uninstall the program.
3.2.c. Restart the computer.4. Disable Internet Protocol security (IPSec):
4.1 Windows Vista:
4.1.a. Click Start , and then click Control Panel.
4.1.b. Click System and Maintenance, and then click Administrative Tools.
4.1.c. Double-click Services. If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
4.1.d. Right-click IPsec Policy Agent, and then click Stop to stop the IPSec service.
4.1.e. If stopping the IPSec service does not resolve the issue, restart the IPSec service. To restart the IPSec service, right-click IPsec Policy Agent, and then click Start.
4.2 Windows XP:
4.2a. Click Start, and then click Control Panel.
4.2.b. Click Performance and Maintenance, and then click Administrative Tools.
4.2.c. Double-click Services.
4.2.d. Right-click IPSEC, and then click Stop to stop the IPSec service.
4.2.e. If stopping the IPSec service does not resolve the issue, restart the IPSec service. To restart the IPSec service, right-click IPSEC, and then click Start.