Steps:
1. Click Start, type: View Installed Updates
2. Hit Enter on your keyboard
3. Select the update, right click it and click Uninstall
4. Restart the system to see if it resolves the problem.
Credit: http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_install/windows-live-mail-not-responding-after-update/ef0f9e3a-1b4b-4923-9dda-1b27191300f3