According to NATS, it will work on windows 7, 64bit - but it won't
Are you using a corporate (e.g. companies) computer? If so, you may be denied the ability to install plugins.
If not...
1. Uninstall the Silverlight SDK/Plugin via Add/Remove Programmes.
2. Clear out your temporary internet files.
3. Visit the site and start again.
It could be because the plugin didn't install corectly first time.
WH
