Hi! vanner, welcome to 7F
Unless You, Bill, Dave_X10_L or members here at 7Fs can find a way to turn off input to Microsoft's Speech SDK 5.1 for Windows, but still leave it as an engine for BVC you are going to need a different combination for win 7.
Your specs show you are running 7x64, and BVC has yet to be programmed for x64.....yet.
See Your, Bill, Dave_X10_L reply #11 & #12 at: Windows 7 compatible with BVC (Short answer is YES!)
Bill seems willing, but as many of us he has too many irons in the fire.
I do not think that with all the grey-matter-power we have here at 7Fs (Think Developers) it would take too long to solve this.
Though it may take a collaboration with your Bill, and our Admins to accomplish it.
Say something to Bill, and I will approach our Admins to see if we can start a collaboration.
Please do not be discouraged if the answer is Nyet!