PDFs in question can be found here: http://s000.tinyupload.com/index.php?file_id=48510348214078437576
Now some more background…
I bought this PC used. The seller said his web browser would crash, but it otherwise ran fine. I’ve only used Chrome so far and have seen a recurring problem with an “Aww snap…” error screen popping up frequently, which eventually does not appear if the same page is refreshed.
Microsoft Security Essentials consistently gets turned off automatically shortly after I enable it. Now it turns itself on for a short period and I can’t disable it (I have Avast running, of course!).
Two security updates have consistently failed to install - KB2742595 and KB2789642
I’m going to just do clean reinstall of Windows, but am thinking if there’s a chance there’s something the community thinks is worth learning here, I’ll be glad to help.