@ David Webb
I do indeed suggest not using any antivirus at all since they are but a placebo, as an alternative I am suggesting that if the operating system and hardware were not so full of holes then a third third party plaster would be unnecessary.
I would never suggest that anything Microsoft produces is either reliable or secure but given that by now this should be well known then I thought it too obvious to mention.
The fix for malware has always been hardware, operating system, applications, user in that order and since the MS/x86 is flawed at the lowest levels then no amount of sticking plasters is going to fix it.
You may but your trust where you like but ultimately the PC as we know it is broken beyond repair.