My computer is VERY SLOW!

Hello, I am new here.....I found this place while in search of how I can speed up my computer. When i boot it up, it says things about the registry hive is in 1 fragment....etc. then it continues and i login. Then when loading my user profile, that's where it gets really slow and never really recovers after that. Opening programs, web pages, videos anything is slow.....except for downloading.....that seems to be a pretty quick, smooth and relatively painless experience.
Any thoughts??
I defragment often, run the disk cleaner, CCleaner, Avast home edition virus scanner, and I purchased Trend Micro Internet Security 2008. I run all those often and don't really come up with much and it doesn't seem to speed up but a little and then bogs back down quickly. Recently it's started freezing up on me and I've come close to throwing the computer through my window.
Here's a little about what I'm running

Windows XP SP2
Intel Pentium 4 CPU 1.60GHz
2.0 GB RAM
NVIDIA GeForce2 MX/MX 400

I have 2 hard drives......ones small, C: drive 68.3GB and F: drive 298GB

I downloaded HiJackThis and will attach a log in case that'll help speed up the process. (tired of slow moving things....i.e. my computer...lol)
Any help would be very much appreciated. Thank you for your time and help!

 

Shoot..............ok, I'll try to figure out how to get it over there. Thank you

 

:wave and welcome to MG's..