

I wonder what version number of Avast he is using with extended kernel, and if he might be inclined to share any other details with us? Was that issue ever resolved, perhaps by the latest version of extended posted here that “avast can get definition updates now”, although he later edited out the remark after I quoted it two posts below. You reported “Kaspersky crashes” in your January 25 post in the lengthy extended kernel thread.

If installing Avast on build 6003, it might be best to use an online installer rather than offline due to the micro-update. (I believe Malwarebytes only called for SP1 or above in those days.) Avast 18.8 had a BSOD issue with build which I mentioned here, but Avast released a micro-update to resolve it. Avast system requirements formerly specified SP2 (and of course no longer mention Vista at all), so I wouldn’t suggest Avast for those who feel that service packs slow down boot time too much. (For more information and official download links see End of support for Windows XP/Vista at Avast Forum.) However, the original post states, “including the extended kernel,” which might break Avast for all I know. If it was a question of the best free antivirus for vanilla Windows Vista SP2, then Avast Free 18.8 would be my recommendation. Don't know whether it's just my issue though. I used to use Avast Free AV (it still receives definition updates on Vista and XP), but it suddenly became glitchy at a point of time. (Avira plans to end support for Win7 and 8.1 at the end of 2021.) Of course in actual practice, an AV that does not properly support your OS can cause serious issues, so you should back up your system before installing an AV. If the idea of the extended kernel is to allow one to use any software that supports Windows 7, then in theory you could try current versions of any antivirus, since they all support Win7. It included an option to deselect the trial of premium during installation, and did not include the ransomware protection that did not work on Vista or XP. If you wanted to use Malwarebytes only as a free on-demand scanner and use a real antivirus product as your main AV, then I would suggest version 2.2.1. Only Malwarebytes Premium (i.e. the “trial”) has real-time protection, and btw their protection scores are not very good in independent tests, and 3.5.1 is a very old version now. Dixel once suggested Malwarebytes 3.5.1 here, but did not specify free or premium.

I do not use extended kernel, but I have followed those threads and can tell you that very little has been written on the subject of antivirus compatibility, so perhaps there is a real need for this thread.
