Trying to get rid of rootkit device/mfeavfk01.sys. Driver object is hidden and AVG cannot automatically fix. Having looked at threads similar to this I have compiled a zipped folder of the logs which you need to analyse this specific problem. I have attached to this thread post.
This device is a leftover from a previous McAfee installation, see this Thread from last year. The link to McAfee in that thread has been taken down (but did not sound too useful). Another McAfee Site thread from a couple of months ago, indicates this is a Broken Registry entry (ref'd file does not exist), but the thread does not come to solution as to how to remove it. McAfee staff never responded.
The AVG Log Entry: Rootkits
;"\Device\mfeavfk01.sys";"Hidden driver";"Object is hidden"
Does not indicate this is from the Registry (but the Rootkit indications are not clear in cases of detections in Memory).
Hopefully, AVG will respond and let us know what exactly this detection is, and suggest a solution.
In the mean time, do you have one of the Registry Cleaner Utilities? They will normally remove any entries when the referenced File is Not Found.
As mentioned by Gary Bee, the driver belongs to McAfee software. It is not recommended running multiple resident security software simultaneously as described here. If the McAfee has not been removed yet, we recommend uninstalling it using usual means. If there are only remnants of the software we recommend uninstalling them using MCPR.exe as described here.
Should you face any trouble removing remnants of McAfee drivers, please contact McAfee customer support for further guidance.