Hello Aud (UK)
I live in the UK and don’t have any of these problems, however I do have Pop up blockers, Anti Spyware, Anti Spam, Ad Blocking, Anti Virus and Firewall programs, and these prevent virtually all of the problems you mention. (The programs are set to check for updates on at least a daily basis)
What I would suggest is clear out all cookies, temporary and history files, and then run the appropriate programs to check for infections. (Particularly Spyware)
Hope this helps.
Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).