Rusty,
Yes, this is what is happening - the ads come and go as I log on or off - or switch pages. But it's been perfectly fine for months - just troublesome since yesterday. I'll see what happens tomorrow , before I try to reinstall.
Maybe I'll try Firefox.....altho I use IE on my desk top. But then you use that on your laptop, don't you?
Re emails - I can send them , I just cannot access what's arrived! No idea why, this happened about the same time as the ads appeared - maybe I've done something catastrophic! (wouldn't be surprised!)
Will have my daughter check it all out if I haven't solved it by next Saturday when she's coming over.