Antivirus instantly blocking TR/Crypt.XPACK.Gen of League of Legends

There is a problem with the new patch of League of Legends, the antivirus is instantly detecting some files as malware and deleting them, i tried with both Avira and AVG and same result happens, even when i disable them i am getting stuck at the ''reconnect'' screen but nothing happens after.

Also i noticed that when the patch came, whenever i was trying to log in it was telling me that ''this account has been logged in from different computer etc'' even though it didnt, i contacted support for this and they told me its their fault and it affects many players.