Windows Live Messenger

Hi, I just upgrade my laptop from XP Media Center to Vista Home Premium. When
I turn on te computer and Windows startup, a small window open saying that
Messenger has stopped working. "A problem caused the program to stop working
correctly. Windows will close the program and notify you if a solution is
available". And when I click close a messege open saying "Messenger was
closed. To help protect your computer, Data Execution Prevention has closed
Messenger". I try to change the setting on the Data Execution Prevention, but
didn't have any success.

Thanks to anyone who can help me.