I upgraded from I think v2.5.something to the latest (v2.7.something) after not playing for some number of months and am getting these errors as well.
Added exclusions to the Saved Game and main DCS folders to Windows Antivirus to no effect.
Guess I'll try reinstalling. Right at the start, before the update, it popped up a dialog saying a whole bunch of files were unneeded and I could keep or delete them; I chose delete. Maybe that's the issue, although rather ridiculous there's an option to delete if so. But who knows, that might not be it, just figured I'd mention it.
Hopefully reinstall works.