There is this thread from Andy/Afro, which is echoing what Brian said he used to get his to work, and which I also used successfully.
http://https://www.mobileread.com/for...ighlight=vista
I've probably got the least amount of computer expertise of anyone reading this thread, but I can identify with April's feelings about all this.
April, at the Command Prompt, after signing on as Administrator, at the cursor I put: CD \BD Program\Book Designer 4.0, hit enter, and then added the regsvr32 GflAx.dll and hit enter again and the program said it had registered successfully. "BD Program" is the name I've given the folder on the C Drive that contains Book Designer.
Feel free to ignore all this if Jon or someone else comes up with something else they feel you should do.
Jim
If, after hitting that first enter you don't get a complaint from the program, you're good to go. I played around with it for quite a while before I saw, sort of, how it worked. Note that you do need the space after the CD.