Well, it may be a little more difficult than one would first think.
It may take quite a bit of time for you to learn and understand what it is that you are looking at in a HijackThis log. But if you truly want to learn, I would suggest signing up for the HijackThis training offered on this site.
Otherwise, if you wish to learn on your own, I can start you with a good HijackThis Tutorial
Unfortunately, its not as simple as just quickly explaining how to analyze it. Some of the people that work these logs (HJT Team) have spent years researching and understanding malicious software.
Let us know if you have any other questions.