|It might be malware. The following two programs are great help at cleaning the decks, at least initially:|
Run the program but before doing the scan go to "Settings > Detection and Protection" and put a checkmark in "Scan for rootkits".
(blue download button near top).
With this one you download and "Save" the file somewhere. Go to the saved file then double click it to run the Scan. You then have options to remove whatever it shows in the table below, although it is usually safe to run the Clean.
If either or both find anything then please copy/paste the logs on here because even if the symptoms are cured you are likely to still have some things lurking around that require further cleaning. If nothing is found let us know.
Always pop back and let us know the outcome - thanks