My windows live messenger account will not sign in even though my passord and username are correct. the error code given is 80072745

Follow below instruction carefully.

1)completely remove windows live messenger from your computer.
2)scan your computer with latest Antivirus.
3)Now download latest version of windows live messenger.
4)install it and try to sign in.

Now it's not work than contact to Msn customer support and describe your problem.

its over if it's not work now than you have to create new account on msn.

Error Code 800488fb

• This error code means that Microsoft suspect you may be a spammer
• You will need to login to https://account.live.com/ Then you will be asked to verify your account

• Finally check you computer for viruses as you password may be been stolen to send spam.

Best way to resolve is to remove the MSN Messenger from your add remove programs, download and reinstall it.
To download http://g.live.com/1rewlive3/en/wlsetup-web.exe

To uninstall find the MSN Messenger from Add remove programs



You can try following steps from link below to solve your problem
http://messenger-support.spaces.live.com/blog/cns!8B3F39C76A8B853F!13931.entry

Hope this helps

Try to clear the cache

C:/users/%USERNAME%/contacts/%YOUREMAIL%
C:/users/%USERNAME%/appdata/local/Microsoft/Messenger/%YOUREMAIL%

Delete these two folders and then restart Windows Live Messenger.

http://www.tweston.co.uk/2008/07/26/windows-live-messenger-problems-80072745-solved/

This error is fixed by the solution here.

try the messenger help webpage and type in: error 80072745 and it will tell you the problem with your messenger

that's because you typed in an incorrect password or username so you can try to troubleshoot when the error appears.

as refer to MSN error code,
You may not be able to sign in because you entered the wrong e-mail address. Re-enter your credentials and try to sign in to Messenger again.

If you sure you are enter correct username & password, second thing to check is your connectivity. In Windows Live Messenger,

1. Click the Tools menu, and then click Options.
2. In the left pane, click Connection.
3. Click Refresh to freshen your display and view current information, such as signal strength, account name, and connection type. — or —
   
4. To run the Connection Troubleshooter, click Start and the troubleshooter will run an analysis of your system and connection settings (Settings associated with your Internet connection.) . If you're using an 802.11b wireless card, the Connection Troubleshooter may indicate that you have a wired connection.
5. Click Finish.

To test your connection settings:

1. Click the Tools menu, and then click Options.
2. Under Connection, click Advanced Settings.
3. Click Test to run several tests on your connections.
4. If you'd like to save a log of your server connections, select the Save a log of my server connections to help troubleshoot connection problems check box.

Error: 80072745 If you are encountering the error code 80072745 when you sign into Messenger try the following: 1. If you are connected to the Internet through a router, remove the connection to the router. Then, directly attach the network or modem cable to the computer. This will help determine whether the issue is related to a firewall setting on the router. Try to sign in to Messenger after you connect to the Internet. If you can connect to Messenger after bypassing your router, the issue may be related to router settings. Try resetting your router (Note: This may revert your settings back to factory default settings and may delete all your custom settings.). Please contact your router manufacturer's Help documentation or customer support channels to determine how to reset your router or enable port 1863 through the router firewall. 2. If you are signing in from a corporate environment, contact the network administrator to determine whether port 1863 is being blocked inside the network.
3. If you have Zone Alarm with IM Security installed on the computer, turn off IM Security for Messenger: 3.a. Right-click the Zone Alarm icon in the notification area, and then open the Control Center.
3.b. Click IM Security or click Security to open the IM Security settings window.
3.c. Click the Main tab or the Status tab.
3.d. Slide the Protection Level slider to Off to turn off IM Security.
Note: This procedure will change the IM Security settings for any instant messaging programs that are installed on the computer.
3.e. Sign in to Messenger again to determine whether the issue is resolved.

4. If you are connecting to the Internet using a Wireless Data card through a mobile phone network, please contact your mobile internet provider to verify if you need to additional data plans that enable you to connect to the Messenger service. Hope that helps!

open the following file in notepad
C:\WINDOWS\system32\drivers\etc\hosts
add the following two lines to the bottom of the file

65.54.239.80 messenger.hotmail.com
65.54.239.80 dp.msnmessenger.skadns.net

align them with tab so they match any other entries and save the file.

go to a command prompt and type

ipconfig /flushdns

hope this helps,
trin