Hi ,
I recommend you do an analysis with Microsoft's MSRT, analyze Windows Defend Offline scan and Malwarebytes.
MSRT: https://www.microsoft.com/en-us/download/details.aspx?id=9905
Microsoft Defend: https://support.microsoft.com/en-us/windows/help-protect-my-pc-with-microsoft-defender-offline-9306d528-64bf-4668-5b80-ff533f183d6c
In the pop-up case, I recommend that you download adwcleaner from Malwarebytes and perform an analysis.
After the analysis, open the command prompt (admin) and run the commands: sfc /scannow and dism /online /cleanup-image /restorehealth, wait for the process to finish and restart the computer.
Then perform a clean boot and if you want to uninstall applications that you do not use.
Give feedback if the information was useful or not.
Thanks