Winlogon.exe devouring CPU

Reeee-ally hoping someone can help me with this.

The speed of my computer (Pentium 4, 1.80 GHz CPU, 256 MB of RAM running on Windows XP) has been slowed down to "glacier speed" and it seems to be the program Winlogon.exe that is eating up all of the CPU. Checking the Task Manager, CPU requirements for this program are consistently fluctuating between 50 and 90%.

I've tried running a few virus/trojan detectors (including SpyBot Search & Destroy) but nothing has been able to fix the problem. I've also tried reinstalling the Winlogon.exe file from a clean (like-OS) system to remedy the file, but no luck.

Attached below is my Hijack This log. Please take a look and let me know if you have any suggestions.

Thanks.

Edit by chaslang: Cleaning steps not run! Inline log removed.

 

Thank you so much for your help. The problem has been cleared.

(My apologies for not reading the CLEAN files first...I must've been in too much of a rush to post my problem. Thanks for having such clear directions.)