Do I have a computer virus of some sort?

Recently...just about a week ago now, I started getting popup ad screens when I go to log into any particular website. Never had this happen before.

I use Bit defender and it's always done well, but I'm not sure what's up with this now.

Also, I've noticed, even on GLP, that there are weird words that are highlighted in Blue, with double lines, like an active link that when you scroll over them they are an ad as well.

So, I did a new scan with bit defender...no issues.

What do I need to do to get this off my computer? I'm not a geek by any stretch.

Do I take it in to get serviced or is there something relatively simple I can do to get rid of this annoyance.

Thanks for any help you can give!