Experts teach you how to deal with MSN in Windows7 can not be started

Excuse me, because I am a rookie, so I still have to ask, when starting MSN, the computer prompts my firewall to block the normal operation of the program, but when the view prompts the security center does not start, how to solve the above problem Thank you! Right, my windows 7 system.. Today Xiaobian also encountered the same problem, I consulted the relevant professionals, give the following solutions, you can refer to the reference. Coincidentally, the Microsoft China Windows Live customer service website released the relevant solutions yesterday.
Microsoft China Windows Live customer service website issued a notice yesterday, notifying that the Windows Live Messenger instant messaging tool can not start properly.
Microsoft's official website said that some users reported that Windows Live Messenger could not be started properly. After investigation, the problem is caused by the failure of the user-installed Shield 2.0 to update the system files, causing the Messenger program to fail to start properly.
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.
Users can use the following methods to fix this problem:
Method 1: Go to the Microsoft official website to download and run the relevant repair.exe tool
Method 2: Users can manually delete the bl in the following path .dat file
Windows XP: C:\\Documents and Settings\\username\\Local Settings\\Application Data\\wlmkv\\ bl.Dat
Windows 7 or Windows Vista: C:\\Users\\username\\AppData\\Local \\wlmkv\\bl.Dat
The above methods can be used for reference.