|mmm - heard of some weird events on the web - but this one is a gem...?|
I suggest wouldn't hurt to run a few freebie utilities...
is a useful model to consider?
I would be looking initially at: adwcleaner, then malwarebytes, then junkware removal - running them in that order
If these three resolve it all - then perhaps be aware of the other utilities and maybe run them as/when convenient?