With due respect for your experience and observation, it would appear you are missing something. The problem is much worse than you imagine.
You may wish to go over to the virus forum and read the instructions there and post the results of doing the scans they recommend. At the present time, the removal of malware is more of an art than an exact science. This is because the people who make malware are criminals and criminals don't stick to the rules.
In fact, there is evidence that the evil attack is well organized, even by political governments of this world. Once you understand that, you can see that it is never an easy job to remove all malicious elements from your computer.
Here is a significant quotation:
http://en.wikipedia.org/wiki/Malware
On March 29, 2010, Symantec Corporation named Shaoxing, China, as the world's malware capital.[24] A 2011 study from the University of California, Berkeley, and the Madrid Institute for Advanced Studies published an article in Software Development Technologies, examining how entrepreneurial hackers are helping enable the spread of malware by offering access to computers for a price. Microsoft reported in May 2011 that one in every 14 downloads from the Internet may now contain malware code. Social media, and Facebook in particular, are seeing a rise in the number of tactics used to spread malware to computers.[25]
And that is only part of the story.
