This is likely related to BitDefender. Uninstall and reinstall and if that does not work, remove it, using the uninstall tool and turn on the built in Windows defender.
BugCheck EF, {ffffba84bfc7d7c0, 0, 0, 0}
*** WARNING: Unable to verify timestamp for atc.sys
*** ERROR: Module load completed but symbols could not be loaded for atc.sys<=== BitDefender???