Lynne, Several things you can do.

Switching to chrome as a browser means less ads and problems.

Download ad blocker. (Chrome ad blocker can be googled)

Delete cookies and temp internet files, then restart computer.

If you still get pop ups, you may have an adware virus and need to run anti virus if you have it.

Otherwise restore the computer to an earlier point to be rid of the virus. (Not guaranteed)

Good on you Jan for expression your gratitude, I am sure the member will see it at some stage and appreciate it.