Virus warning with MS?

Solution:
1.) Open up AVG Anti-Virus Tray (Should be in your tray on Windows, at the bottom Left)
2.) Go to "Tools", and click "Advance Settings"
3.) Under Resistance Shield, click Directory Exclusives on the left.
4.) Click "Add Path", and add the directory of Maplestory (by default: C:\Nexon\Maplestory).
5.) Click Apply/OK. And you're done.

Thanks, it worked for me, although I still had to patch my old folder -.-