I'm pretty sure MBM5 stopped development a few years ago. You can try to use it if your motherboard is supported but I'd say you should have a look at speedfan (http://www.almico.com/speedfan.php) which should still work with the SFXXX labels as described by skin commands.txt:
"SFXXX" - Information from SpeedFan -- SF codes start with a letter denoting the type of Info.
'v' for voltage, 't' for temperature and 'f' for fan.
For instance '"SFV3" would be the third voltage sensor