I too have had the same problems when analyzing the Hijackthis log. It is very detailed and takes a lot of time to check. You really have to go thru the entries one by one, those that you don't recognize or are questionable needs a search to determine if this process is valid or invalid. This log can point to major issues or very small one. I am not an expert on this and will not recommend any changes because of that, I don't want to give you advice on what I would do and then have it muck up your computer. At first glace you do seem to have a lot of stuff running in the background. How does your startup menuj look? I have always believed its best to be very lean on all my services, whether they be startup or background. I run malwarebytes and a few other programs often but manually. The only thing I do use other than my anti-virus in the background is WinPatrol,
http://www.winpatrol.com/. Its a very small program but will notify you of any changes to your system, notabaly your registry. I see a lot of file missing's at the end of your log, not sure what that is about. In the past I have had issues with my log too and not being an expert I have used this:
http://www.techsupportforum.com/forums/ Its free to join and they do a lot of hijackthis log files. I hate to not give you a better answer but its not my computer so.................
One question I wondered about is have you thought about just saving whats important, flash drives are cheap and easy, and then doing a complete reinstall of your system? Often when things get so mucked up its better to just start from scratch. Good luck