scroll bar/slide bar disappears after a few seconds very anoying

I believe it is intentional. While perusing content that requires the use of the vertical toolbar, one ends up clicking on the ADVERTISEMENT in the position previously occupied by the scrollbar, thus SELECTING and OPENING nuisance ads.  No doubt this is a bow by MS (and likely a perk that cost advertisers more for that sweet spot on our desktop) to Google other search engines that get a nickel for each time we click that ad.

I am using windows 7 Professional and this started with installation of IE11 and related updates and security updates on 5/13/14. It is only when I use IE11. Hope I will see an answer below.

Exactly!  I also find it maddening that the "helpers" answer the question with a question, asking for more information, before they can provide the answer.  How stupid are these help personnel any way?  Use your windows 8 computer for more than 10 minutes, man, and you won't have to ask us what we're talking about!

windows 8 sucks and is not worth the money to upgrade. typical of ALL engineers, who create new and "BETTER" operating systems whether it be an ignition switch [GM], an  8 speed automatic transmission { Jeep Cherokee} or some other part or piece of equipment as an upgrade, it should be remembered and impressed on engineers that tried and true are best left alone and stop screwing up what works . Microsoft really messed up here and aren't even trying to help their customers on the issues with windows 8. I'm finished with windows, good ridence

My scroll bar disappears also. I noticed it on the Sony AND T-Mobile websites while perusing cell phone offerings. I imagine it happens on other sites I haven't paid attention to yet.

I use Windows 7 with Internet Explorer 11. I didn't have this problem with previous versions of I.E., and I've been using Win 7 for several years now, so I doubt the problem originates from the OS.