I have the same problem as tsahima, i just got to the last step of your instructions and now get this log when running mbr.exe from the windows folder
Stealth MBR rootkit detector 0.2.4 by Gmer, http://www.gmer.net
device: opened successfully
user: MBR read successfully
kernel: MBR read successfully
however i'm lost as to what this means etc as i'm not the most computer savy person!