It is beginning to look to me that you are seeing repetitive downloads which are actually not the same download. For example Java is notorious for being so buggy it can get several updates a month at the moment. These updates might well all have the same name, but are actiually a debug-of-a-debug thing.
In a similar way AMD catalyst drivers are frequent. Especially if it calls itself a beta, it is certainly not expected to be right-first-time, so another one will be coming......
You are probably aware that Java at least has an entry in control panel, in which you can define that the updates should automatically appear, or not. I always either (a) dont install much adobe and sun and oracle software in the first place (b) always choose to check myself for updates. I become aware of the need because many browsers tell you their add-on's need updating or you can subscribe to free US-CERT Alerts for which the latest Java alert was US-CERT Alert TA13-032A - Oracle Java 7 Multiple Vulnerabilities dated 02-02-2013 (for instance).
You might have turned off some software automatic updates, but you can find it quite hard, and I have seen rumours that some software is ignoring 'dont download' instructions and most reset it 'on' after every update anyway - including those you do yourself.
That is my reading for some of your downloads, anyway. Word or PDFs, music or pictures reappearing is not so clear, but possibly you need to research what the confounded 'libraries' feature in Windows 7 is doing. It is not the files themsleves that you see there, it is indexes and links to them. You can delete the index or the link, and
by design it will reappear when Windows does it's maintenance thing untill you delete the actual file in it's actual location.
I might be wrong, but I'm fairly new to Win 7 myself,
http://www.makeuseof.com/tag/windows-7-libraries-–-and-why-you-want-them/ and I think I have seen other comments to the effect that they can have unexpected side-effects and be a bit of a nuisance at times.
