Malwarebytes have a free version which works as good as the paid for version but the paid for version has a few extras and well worth the low cost.
Even if you have an Antivirus (AV) program installed, it’s a good idea to run a scan with Malwarebytes (MBAM) from time to time. MBAM, seems to find things that paid for AV misses. The recommended advice is not to have more than one AV product installed but MBAM is made to work alongside AV programs and rarely falls out with the others. It works very well alongside Windows Defender, even the paid for version (which runs in the background and auto updates)
Using couldn’t be easier, just fire it up and click on “Scan Now”.
The scan might take a while, sometimes upto 30 mins or more (it’s very thorough).
After the scan has completed, it will give a report
Hopefully you will get the above screen. If it does find anything, you will get a list of problems which it will fix. Usually needing a restart of your device.