OK the following programme will find nothing however, it appears to reset a component somewhere within windows and stops the alerts

Could you download and run Kaspersky pure trial from here http://www.kaspersky.co.uk/free-trials/pure
This is similar to AVP but is win 8.1 compatible
It will offer to remove Avast skip that and set the Avast shields to off for one hour

Once Kaspersky has installed you will see this screen

https://dl.dropboxusercontent.com/u/73555776/kas1.JPG

Select scan and allow it to update

https://dl.dropboxusercontent.com/u/73555776/report.JPG

Once the scan has completed and it has removed any threats select report on the top right

Click detailed report and post that here.

It appears that this may well kill it, but I will need the report to determine what it is so that I can then remove it manually

https://dl.dropboxusercontent.com/u/73555776/detail.JPG