I'm just wrapping up with an older XP laptop what was badly infected with malware. Here's what I used:
VIPRE - Our native antivirus
SuperAntiSypware
MalwareBytes
Kasperky's TDSSKiller
I have ComboFix in my arsenal of antivirus apps, but I don't use it unless I have to since it will occasionally break a legitimate app.
As anyone published a recommended sequence of antivirus apps when running multiple antivirus apps is necessary?