Win7 can not start msn how to do

MSN can not start under Win7 and report an error?
MSN is our usual chat tool, but recently because many Windows Live Messenger users can't start MSN because of the update, the official has given an explanation, saying that MSN can't be started because the user installed Protector Shield 2.0 is updating the system files. A failure has occurred. The situation is different in different system failures.
Users under XP may encounter the prompt "unknown software exception(0xC00000d)" when launching Live Messenger, and Vista and Windows 7 users may not be able to start the program.
MSN can not start the error under Win7 can be solved by the following method:
Method 1: Go to Microsoft official website to download and run the relevant repair.exe tool
Method 2: Users can manually delete the following path Bl.dat file
Windows XP: C:Documents and Settings username Local SettingsApplication Datawlmkv bl.Dat
Windows 7 or Windows Vista: C:Users username AppDataLocalwlmkvbl.Dat