At my Family History Center we have 5 new computers (Windows 7 Home Premium 64-bit) and PAF functions normally on them. I wonder if PAF failed to install correctly on your computer. In your place, I would remove PAF and install it again, accepting all of the defaults suggested during the installation. (You will notice that 64-bit Windows 7 wants to install PAF in the folder "x86 Program Files" instead of in "Program Files".) If you need to browse for PAF, that is where you will find it.