W7 won't save/move/delete PDF files or recognize Administrator privileges
I have an annoying problem involving W7's Administrator privileges vs. PDF files and it's starting to drive me mad (actually, with me that's not really much of a drive; it's more like a tap-in putt!). Unfortunately, I don't have a coherent picture of the problem to offer, only a handful of different symptoms that I hope someone smarter than I am can piece together and make sense of. For the record, I'm using Adobe Reader X, Ver. 10.1.4.
A) If I make any alteration in an existing PDF document in Adobe (such as adding text, highlighting, etc.) and try to save it, I sometimes get the following message:
Sometimes if I do Save As/PDF and give it the same name, I can get W7 to save the file, but otherwise I have to save the file with a different name in order to get W7 to save it.
B) Sometimes when I try to save a new version of a PDF file to an existing PDF file name, instead of asking if I want to overwrite it, it gives me the following message:
C) W7 sometimes won't let me delete, rename, or move certain PDF files, at which point I get this warning:
Occasionally I find that some PDF files have the blue and yellow shield next to them and ask for Administrator privileges, which I have, but which W7 apparently doesn't recognize. If I try to delete the file, I can't, as it asks me for Administrator confirmation to continue, but when I give it, I still end up with the warning message above. If I then click on the undeleted "deleted" file to open it, Adobe displays an error message saying that there is a problem with this file and it can't be opened, so it may be partially, but not completely, deleted. As a result, I have a lot of dead carcasses of former PDF files remaining in many subdirectories, files that W7 won't let me move or delete.
I can't figure out:
A) Why W7 won't let me save a PDF file I'm working with to its own name;
B) Why W7 is even asking for Administrator privileges on some (but not all) PDF files; and
C) Why, when I try to save/move/delete some PDF files, W7 puts up its message window with the "Continue" button with the blue and yellow shield, asking me for Administrator confirmation, yet doesn't recognize my Administrator status and pops up a message telling me I need permission from the computer's administrator.
To the best of my recollection, this has only started in the last couple of weeks or so, but because I use PDF files a lot, it has quickly become a royal pain. So far, at least, I haven't been able to discern any clear pattern of cause and effect that might lead me to the solution, so any and all help on this will be hugely appreciated.