From your last log:

O16 - DPF: {42F2C9BA-614F-47C0-B3E3-ECFD34EED658} (Installer Class) - http://www.ysbweb.com/ist/softwares/v4.0/ysb_regular.cab

That means you have downloaded a toolbar that is infected with malware.
It may be this happened without you noticing it.
Make sure to set your browser to NOT install anything without specifically giving permission.
Have a look HERE for security settings.

After you have done so, follow the procedure in the malware removal section again.
Those instructions have never failed to solve a problem like this unless the user didn’t followed them correctly or if the user allowed the system to become infected again.