My guess is that you may have recently downloaded some free software such as a video recording/streaming programme and some malware has come along with it.
It is important that you remove immediately what has been identified by your AVG as Generic 5 because it is a Browser Hijacker.
Download and run a Scan with the free edition of Malwarebytes; making sure that you Do Not accept a trial run of the Premium edition. Untick boxes as appropriate for anything other than Free Malwarebytes.
https://www.malwarebytes.org/
Hans.