as the OP uses CCleaner, probably regularly, and they have a fairly new machine. the problems are unlikely to be caused by extraneous files and a bloated registry. nor should it need defragging just yet.
i have no idea how to explain all the xml files, but the problems with net access could well be laid at Poser8's door, for the simple reason that parts of MS Internet Explorer have been incorporated into the app, and it may well be messing with the OP's access ports.