I had this same problem and the solution that worked for me (the hp connection manager said the device manager disabled wireless) is typing in "device manager" in the start menu and selecting "device manager" to open it. Under network adapters is listed wifi. If you right click it, you can click on enable. This fixed the problem for me. Now if I click on the wireless button (f12 key) if changes from on to off and back again.
This is for windows 7 64 bit. HP Pavilion dv7-6195us Entertainment Notebook PC.
I tried this but under network adapters there is only Realtek PCIe GBE Family Controller.