Vundo, virut, bho, smitfraud

This PC was and is very seriously infected. Even thought the scans remove a huge amount of problems, you still have a very badly infected PC. And the worse infection of them all is a Virut infection that will infect all executable files on the PC. So this leads us to the below bad news.

I can see the reason for your problems. Your logs show that your Windows Operating system files have become infected and there is no known reliable fix for this. In addition there are many many other infected files. We could spend a lot of time trying to remove this infection, but odds are that it will not work because the nature of the infection has so many executable system files infected that as soon as we fix one file, other files that are infected will almost immediately or upon the next reboot, just reinfect the files. In addition, your PC would still basically be unreliable/untrustworthy even if we manage to fix the infected files that we can see since there could be many more that we are not seeing.

The safest thing for you to do is backup your personal data immediately since your PC could possible become unbootable at any point in time. Do not back up any executable files. This includes programs that you have downloaded since any of them could be infected.

Once you backup, you need to delete all partitions, repartition, format partitions and reinstall Windows.