Well I just fired up a Windows 7 virtual machine to have a look at your query, fully expecting the weather gadget to be fine.
But it's showing the same error here also.
I can't say I've used the gadgets much ever since they were introduced with Vista.
I've just had a look around and it appears Microsoft is dropping support, and therefore any data feed, for the desktop gadgets. All focus is now on Windows 10 and to a lesser degree continuing support for Windows 8.1.
(Citation: Gadgets have been discontinued - Microsoft Windows)
I highly recommend you upgrade, Windows 8 etc. are a nice evolution over Windows 7.
Alas, there is no 'Weather Gadget' but there are various different Weather Tiles with Live Update! :P