This hotfix fixes Install issues, allows proxy configuration, and solves “install for everyone” issues on Microsoft Vista.
There are two methods to install this hotfix.
1. Download and run this Hotfix: http://content.worldwidetelescope.org/update/wwtsetup.msi
2. In WorldWide Telescope click the down arrow under Settings and click “Check for Updates”
"The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!', but 'That's funny...'" Isaac Asimov Microsoft Research<