Hello, I do realize that this thread is nearly two years old. However, the information herein solved my problem and I had some difficulty finding this information. If it had been dated more recently or had mentioned MonkeyRok, I believe I would have found it much quicker. I have MonkeyRok installed, and I believe that is what was triggering the "
an active x control on this page might be unsafe to interact with other parts of the page" error every time I would start MediaMonkey 4.0.6. Like the original poster, I too am running Windows 7 x64, however since this is 2012, it's SP1 and not a release candidate version.

Even in 2012, there still is not a registry key for
1201 at the given location. However, creating the key (DWORD 32-bit) and giving it the value of 0 (zero) solved the issue like it did for the OP. I tried tweaking just about every IE9 setting that I thought would be relevant and nothing worked until I found this.
I would have just added this to the long MonkeyRok thread where I first saw the same solution posted, but that thread is locked. I didn't try it when I saw it there because I didn't have the 1201 value in my registry and that solution was posted in 2007 before Windows 7 was released, so I didn't think it applied. When I finally found
this thread and saw that the OP was using a version of Win 7, I tried it and it worked. I only wished that I had found it much sooner. With this bump and mention of MonkeyRok, perhaps anyone else that runs into this will be saved the headache that I endured.