From the HijackThis-log, I can tell you that the only thing suspicious running on your PC (except those 'unknown'/'noname' processes) would be the Google toolbar Add-On. Unless you're using it regularly, I suggest you remove it.
An XP Home SP3 running on a 1,40 GHz Pentium 4 at 100% usage along with ~500MbB RAM does not really seem suspicious. Is this behaviour very "not normal" for your PC?
(Also, try avoiding screaming HELP etc., you may want to review the community guidelines should you risk getting moderated)
Edit:
What anti-virus are you running?