Sure enough, there was Blekko. I don't think these guys are novices. Changed it to ixquick. Hope it sticks. Might have to demolish IE9.0. Hate to do that.
Acrobat professional comes along with Adobe CSS 2.0. If I recall, it allows .pdf editing seamless with InDesign (hi-end desktop publishing) Are you seeing a problem. I may have updated it. Adobe updates sometimes go on my machine as an unconscious gesture.
I do save .pdf files quite often. Could get by with the reader if you suggest. Rarely if ever use the pro features.
As for Sentinal, that was not my doing. I've been around the block with the protection scam. Never heard of it. Main thing is I can't find it to uninstall it. I'll look again. If I type it in under Search Explorer, no results. I've been looking for it since you noticed it.
Have no idea.