I suggest you try the Malwarebites programme first Michael.

It will just scan your system and tell you what nasties have sneaked in. You can then at least clean them off before trying anything else. Different to viruses.

It is unlikely that it has anything to do with your provider. So forget that.

Something is not set right, or is malfunctioning on your (Windows ?) operating system.

There may also be another programme or add-on that is interfering with things.