Now with the 0x80070424 error code; your registry may have become damaged by a form of malware like a rootkit (not all AV programs are perfect) and therefore you may need to repair your registry.
Read this tutorial to help you: 0x80070424 Solution
Hope this helps,
and System Restore
beforehand. Please post back your results.
EDIT - Were the two AV programs from trusted sources? The offical Microsoft website and Malwarebytes website?