ClamWin Portable with MSN

1. Install ClamWin portable with ClamWin Portable | PortableApps.com - Portable software for USB drives

2. create batch file clamscan.bat
rem you have to modify the path to fit your installation
C:\Tools\ClamWinPortable\App\clamwin\bin\clamscan.exe -d c:\Tools\ClamWinPortable\Data\db %1
rem pause the windows cmd screen
pause

3. Put the batch file path into MSN



Done!

reference:
clamscan(1): scan files/directories for viruses - Linux man page