missed few points,also keep this in consideration make sure to clear your temporary internet files and cookies and restart msn. from -http://messenger.msn.com/Help/ Try the following to help resolve the situation: 1. Click the MSN Messenger icon in the taskbar (next to the clock), and then click Exit. 2. Make the following changes to your Internet options: 1. Click the Microsoft Windows Start button, point to Settings, and then click Control Panel. 2. Click Network and Internet Connections. 3. Click Set up or change your Internet connection. 4. Click the Content tab. 5. Under Certificates, click Clear SSL State. 6. Click OK when you receive a confirmation. 7. Click the Advanced tab, and then scroll down to Security. 8. Make sure that Check for server certificate revocation (requires restart) is not selected, and that Use SSL 2.0 and Use SSL 3.0 are selected. 3. If your computer is running Microsoft? Microsoft? Windows? XP, clear the DNS resolver cache. 1. On the taskbar, click Start, and then click Run. 2. In the box, type cmd, and then click OK. 3. At the command prompt, type ipconfig /flushdns, and then press ENTER. 4. Try to sign-in to MSN Messenger again.