I am a computer scientist and checked a PC with Vista yesterday with the very same problem (home edition, french, incredimail installed). When the page is blank, you can right-click on it, go to properties and see that it is a mostly empty html file that belongs to Magentic. You can ALT-SPACE and close the window or WINDOWS+D to get the desktop. Then uninstall Magentic or tell it to avoid starting when windows starts and kill the process or it will generate another HTML file and display it on your screen.
Don't forget to clean all the messy HTML files generated. I don't know why this program has that behavior.
The file was at
Code:
<User>\AppData\Local\Temp\Magentic\Mag3948.htm
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