1. "When starting Visualizer for iTunes I get a blank screen and nothing happens. I also see this error in my most recent log file (.e.g. c:\Program Files\Visualizer\logs\7-12-2008_Results.log): 'iTunes version is UNKNOWN! iTunes error - check your iTunes installation!' What is this?" - This problem is caused by a corrupted iTunes installation. The iTunes installation creates some Windows settings that are used by other applications such as Visualizer. These settings can sometimes become corrupted by other iTunes applications or rarely by iTunes itself.

To fix this problem you will need to run a repair on iTunes. Don't worry this does not mess with your iTunes Music Library, it just makes sure iTunes has all the correct files and double-checks iTunes Windows settings.

For XP, follow these steps:

1. Click the "Start menu" in the lower left of your screen
2. Click "Control Panel"
3. Click "Add or Remove Programs"
4. Scroll down until you see "iTunes" then click it.
5. Now click "Change" then click "Repair" and just let iTunes repair itself

For Vista, follow these steps:

1. Click the "Start menu" in the lower left of your screen
2. Click "Control Panel"
3. Click "Programs and Features"
4. Scroll down until you see "iTunes" then right-click it.
5. Now click "Repair" and just let iTunes repair itself