Hello grc5514,
I understand you are inquiring if your Photosmart Plus will work wireless with Windows 7, as it works with Windows XP. The answer is yes. it will work with Windows 7 as well. You will need to run the installation to connect the computer to the printer and ensure it is connected to your router. I will post the instructions for you below.
Installing the Printer Software on a Wireless Network
I hope this helps you!
Good luck:)