To properly uninstall and reinstall iTunes
Attached is a link on how to properly uninstall and then reinstall iTunes. I originally wrote it as a fix for the ITunes 10.4 Blank iTunes Store window problem, but it is really specific instructions for uninstallation and reinstallation of iTunes. If you are upgrading to the latest version of iTunes you won't have to bother with copying and renaming the iTunes Library.itl file. You will if you are downgrading to an older version of iTunes. I think a proper uninstallation and reinstallation of iTunes will solve a lot of problems, not just the Blank Screen one. I hope this helps. Please let me know.
https://discussions.apple.com/thread/3287035?answerId=16017918022#16017918022
iTunes 10-OTHER, Windows 7