[LilaFrabel]

Originally Posted by DNSB

If you are running Windows, Windows Defender is a pretty decent antivirus. Just avoid having your calibre libraries in your Documents directory (search on Controlled Folder Access as to why that recommendation). Otherwise, you might want to check into the Sophos free version (Home Free, their Intercept-X product is nice but it has been suffering from feature bloat in the last while).

Originally Posted by BetterRed

@Bealollina - I haven't needed any 3rd party active AV software since I upgraded from XP to Windows 7 in 2009 and gave Defender a try.

I don't exclude anything from it. It doesn't have any discernible effect on performance of any applications. On downloads I have had one false positive, and three real malware detections which were quarantined. Apart from those, the only time I get anything from it is when it slips me a note every few days to tell me its scanned my system this-many times and found no malware.
BR

Originally Posted by georgemk

Another supporter of the builtin Microsoft Windows Defender anti virus software. Had no issues running it and its predecessor from Windows 7 onwards.

Prior to that I was using AVG but dropped it due to excessive cpu usage.

Originally Posted by JSWolf

I ran the free version of AVG until it started to slow down my computer. I then dumped it and ran Windows Defender until Windows 10 which comes with Windows Security.

Originally Posted by theducks

and befor that, I dumped Norton for the same reason.... Bloat, that any careful net user could avoid most harmful sites/stuff.

So, I uninstalled Avg (and I realized it heated and slowed my Pc a lot) restarted Windows 10–more than 1 time– the problem is still there though, ebooks can't be opened . I even uninstalled some unnecessary browser, even if I don't know how this could be related to the ebook issue.

I gave a look to this Windows Defender and it's been there the whole time, silent and –apparently– full working.
Calibre main Library is –was– on Dropbox on a subfolder in Document directory – just moved it– but it has been there since the very first beginning (very long time ago) so I would not consider it the main cause . Folder moved (still on Dropbox), Library moved, situation not changed.


I went to Settings in Windows Defender and it seems like that Controlled Folder Access is not activated, but I have also CCleaner and when my Pc was quite out of space I used it several times, maybe it's not related to the issue but it has some Antivirus (and similar) functions too I guess. Should I exclude some app or folder from its "checkings" and protection activities?


I activated the automated adding from a folder directly on Calibre library, from Calibre ebook adding settings, some weeks ago, now I think that perhaps this could be what the antivirus (and similar apps, such Defender and CCcleaner in my case) may have seen like a "suspect" activity.. At least the timing seems quite corresponding. I disabled it, just in case, but nothing happened.

I'm tempted to repair the library from the installer, again. But it's not a long term solution apparently.