I fail to believe that people downloading Steam games, even if thousands people are downloading them, would affect my CPU usage while playing Dungeon Siege III. I also don't believe for a moment that buying a new CPU is the solution to my problems. I don't think any of us can afford (or even would be willing to, if they could) buying new parts every time we come across a software issue. My processor is outdated at this point, but it remains a great processor that has thus far fulfilled all my needs, gaming or otherwise.
And the tone of your post is completely unwarranted. No one here has given you any reason to write such a disrespectful post, in which you also don't provide any useful information whatsoever.
Now hopefully we can move on and continue talking about this issue.