Windows Vista has a "Parental Controls" setting that causes SmartMusic to load slowly and the Activation and Home screens to appear empty. To resolve this problem, you will need to log in as the Administrator account on this computer and disable Parental Controls for the problem account.
The following article from Microsoft can provide assistance. Follow steps #1-3 in the article below, but click "Off" in step 3.
This problem does not occur in Windows XP, 7, 8 or 10.