I echo my good friend signals' comments and advice.
I have my system configured the same way.
Is it possible to run both simultaneously?
Perhaps...with certain discs, but you will receive a warning from Fab to disable AnyDVD and frankly,
it's not advisable as already pointed out.
I can't remember the last time Fab failed to decrypt a movie for me.
Even the rare problematic discs which fail initially, are handled by Fengtao within a day or so.
You are far more likely to experience conflicts and problems with both running.