Run TDSSKiller on all 3 systems again please and follow it up with a fresh Combofix log (the system with AVG will need to uninstall it again)
[*]Download TDSSKiller and save it to your Desktop.
[*]Extract its contents to your desktop.
[*]Once extracted, open the TDSSKiller folder and doubleclick on TDSSKiller.exe to run the application, then on Start Scan.
Download ComboFix from one of these locations:
* IMPORTANT !!! Save ComboFix.exe to your Desktop