Not sure what you are talking about. I haven't heard anything about Xfinity Stream no longer being available through a web browser. Maybe you are using an old or oddball browser that will no longer be supported? Or maybe it was some sort of spam email.

will we still be able to stream to Windows computers ...

Yes. The only thing that's going away is the "xFi website" or "xFi portal" at https://internet.xfinity.com/ which is used to monitor and control rental Comcast combination modem/router gateway devices. See https://www.xfinity.com/support/articles/xfi-app-and-portal.

The xFi website is going away

 

As of June 7, 2022, the Xfinity xFi website found at internet.xfinity.com will no longer be available. But don’t worry – your service is not changing. All the features of Xfinity xFi are available right from the palm of your hand with the Xfinity app.

The Xfinity app is the easiest way to manage your Xfinity experience. Not only does it provide the ultimate control of your home WiFi network with the ability to assign user profiles, view and control connected devices, test your speeds, and enable Advanced Security, it also allows you to manage your Xfinity account and get help whenever you need it – 24/7.

Once the website is retired on June 7, 2022, you will be unable to adjust any of your WiFi settings, pause WiFi, or use other existing parent control settings unless you download the free Xfinity app. If you haven’t already done so, be sure to download it today!

 

We hope it gives you peace of mind to know that you can control your Xfinity xFi from anywhere. We'll keep you updated as we continue to streamline our app experience and simplify the ways you manage your services with us.

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So, it was all just a bunch of hot air?  How appropriate to kickoff summertime during an election year.