Virus or malware

I got a (Your browser is being managed by your organization.) that automatically changes my browser from Google to Yahoo.  I've tried scans and following internet tries and fixes and cannot eliminate it.  I feel AVG should have caught this or at lease recognize and quarantine it when I run a browser and virus scan.   anyone with a fix?

Hello Keith,

We have replied to your original post: https://support.avg.com/answers?id=9060N000000gbqU
Keep up the conversation through single thread in order to get quick assistance.
Thank you.

Hello Keith,

We have replied to your original post: https://support.avg.com/answers?id=9060N000000gbqU
Keep up the conversation through single thread in order to get quick assistance.
Thank you.