I actually heard this one earlier, but I changed a couple things. I'm pretty sure that it works:
Groove Agent installs a bunch of .dll files all over the computer so that it can interface with the ramistat core through the ferematal drive unit. Now you need to use the search function to find all of the .dll files (search for *.dll) and then go through and systematically delete all of them. If you don't delete all of them, then the crack won't work. Once you do that, then you can proceed with the magnet trick.