I just got my Slingbox 350 hooked up. I set it up with my laptop that runs Windows 7. I then went and logged in on my Windows XP Home PC using Chrome and it runs fine. Not sure why they say they aren't supporting XP. It works. Maybe it is because I set it up on a Windows 7 laptop. If I would have set it up on a Windows XP PC maybe it would have crashed. Also, I have not tried Internet Explorer because I don't use it and always use Chrome so I cannot tell you if that works or not on XP. But I can tell you Windows XP using Chrome works fine.