My antivirus (Kaspersky) detects the Blizzard launcher being patched as being similar to a known keylogger.
I keep adding the exception, but it really doesn't like when the launcher has an update.
Game updates run fine.

The only way to update the launcher, is deactivating the anti virus.
Seems quite funny, that Blizzards legitimate program comes up as similar to a keylogger and is not allowed to progress.