Hi Miguel de Cervantes,
In order to help you further with this issue we need to validate the following information:
1. What is the Operating System you use?
2. What is the version of MSN Software?
3. Do you get any error message when you sign in, sign out, viewing emails in Msn Explorer? If so please provide a detail description?
Things to try:
Try to Optimize your browser settings please follow the instruction provide in the below link:
How to optimize Internet Explorer browser
http://windowslivehelp.com/solution.aspx?solutionid=3c7c3338-369e-4220-b29d-71ce660fe5a0
How to find the version of MSN Please check the link below
http://answers.msn.com/solution.aspx?solutionid=b1568530-1f0b-4040-99ab-f9cc6c60d532
Please reply back for further assistance.
Thanks!