Odd, if you aleady have Silverlight installed you shouldn't see that.
What was the name of the project and your user name so we can have a look at it?
Also don't suppose you could take a screenshot of the gasget displaying the graphic? You could email it to puff.nospam@microsoft.com (removing .nospam).
Ah, the problem is Silverlight and 64bit isn't so great a combination, and isn't supported by Silverlight, if you run the 32bit IE on Vista 64 everything is fine however the sidebar runs the native IE 64 bit. There is a 32bit version of the Sidebar which you can find at
The scroll bars is our bug though, at the moment we are working on making sure the Silverlight blocks resize correctly which many of them don't do at the moment.
You could also set your sidebar to load the 32bit version by default the registery key for it is at: