To use the (models: LFH-3500, LFH-3504, LFH-3508, or SMP-4000 series) on Windows 7, you need the correct drivers and dictation software. Philips has discontinued direct support for Windows 7, but legacy drivers still work.
For the best stability on Windows 7:
If you’ve just dusted off a legacy Philips SpeechMike Pro or are setting up a workstation for medical or legal transcription on Windows 7, you may have hit a snag: the device isn't responding, or the programmable buttons aren't working. philips speechmike pro drivers windows 7
Philips SpeechMike Pro Drivers for Windows 7: A Complete Guide To use the (models: LFH-3500, LFH-3504, LFH-3508, or