Even if you do have some form of anti-virus and anti-malware, it is not guaranteed that it will clean it up fully. No software is. I would strongly recommend thoroughly cleaning up your PC and then checking if the problem persists. It looks like you could be dealing with some form of adware.
1. Restart your PC in “Safe mode with networking.”
2. Install and run RKill to kill malicious processes and services
3. Check your Programs and features and see if there are any new recently installed programs that you don’t recognize. If there are, remove them.
4. Do a full suite scan with Malwarebytes
5. Clean up your Registry and Cached files with CCleaner
6. Restart your PC in normal mode and do an additional scan to confirm that the...