Hi,
have, please, tried to re-install the software? If its persistent after reinstall I am afraid only Kubecj, the owner of the blocking database can decide what is causing this false positive. If you are able to setup any kind of remote connection (remote desktop, VNC ) to your PC, I'd like to see it in person - provided avast was reinstalled already. Drop a note here, if you still care about the result. And sorry.
Lukas.