Hi guys.
Don't know if this will help with your problem but in Bitdefender I added and exclution rule to not search the temp folder where the extensions were being installed or rather the temp folder my virus software said the virus was found.
I spoke to the technicall department at Bitdefender and they aren't sure why or how this happend but that sorted out my problem and now I am back up and running again.
Hope this helps a little.