just by comparison to my laptop, it looks great. Don't forget to tweak your PC up!
This video explains how to turn on that second core(as well as a few other things). Unless you only use your computer for gaming, you should do this. If you do an ounce of work on your computer, or your games are multithreaded, enable this.
Then get an antivirus, at least AVG avira or avast (the top three free AVs) Traditionally avira gets better virus detection ratings when done in independent studies. Then get spybotsearchanddestroy