Hi guys the fix button is for TDL4 infections only and the fixmbr is for mebroot and sinowal infections, they both take different routines to to run. So if the fix button is available then there is a TDL4 infection. If only the fixmbr button is available and it is showing mebroot/sinowal then run fixmbr - unless the system is a dell (they have a special MBR to account for the recovery partition)