Hello bigape. I understand you are experiencing Bluetooth issues between your Windows 7 computer and speaker. I will do my best to assist you! For starters, attempting the troubleshooting steps in this HP document regarding Bluetooth issues should resolve the issue. If not, advanced troubleshooting will have to take place.
Let me know the results of your troubleshooting when complete. Thank you for posting on the HP Forums. Have a great day!
Mario