A handful of us donated to Whoknowsit to so he could buy ALL the upgraded guides for MoP for all of us. That was an investment into THIS community not into torrents or into any other. We want it to remain safe for us to continue to use. Whoknowsit is smart enough to know what to look for to take out Zygors' tracking info, but he knows he is NOT perfect. That is why he is STILL careful.
Besides registry cleaner, it is also necessary to perform a defrag for your computer hard drive regularly, which is not only a good way to optimize your computer system's structure, but also can help you clean those fragments created in the incomplete program removal. There is a specific computer defrag utility available on the Windows operating system that enables the computer user to perform a defrag for the computer disk, or you can choose a free third party defrag tool like Auslogics Disk Defrag that opimize your computer disk in a quicker and more effective way.