Not anti-virus I don't think
I don't think it's anti-virus as all that's on there is Windows Defender. There's literally noting else running. Also, just as a test I copied a whole load of stuff on to the card and filled it with no errors. Then I overwrote one of the files and when I said replace it, it did. But that was Windows, not EZScan. EZScan will happily copy a bunch of stuff to the card, but gags on rewriting my Vscan 001 files. I only have the one, but it would never get to 2 anyway. If I have EZScan format it in the computer and copy the files at that time - no problemo.Well this is something I have not encountered, possibly someone else has can give some suggestions also. I might suggest temporarily disabling any anti virus or the option to monitor removable media. I know some anti virus programs monitor removable media, maybe something like this is messing with EZScan. I am just trying to suggest some options now, process of elimination so to speak.