Would be nice if you scanned with Malwarebytes and Hitman Pro so that we could see what those infections were. I know qihoo actually doesn't do well when dealing with PUPs but they are mostly very strong in blocking severe threats like trojans and backdoors. Those things that were missed by qihoo might have just been PUPs, not that missing PUPs are a good thing but I think it would be much better than missing that amount of actual malware.