I did not see this problem addressed here but for those of us not rolling back to XP and not running a MAC here's the lowdown on the "i-Tunes opens up entirely black" problem that a lot of Vista users are encountering.
If you go to C:\Program Files\itunes\ (or where you installed i-tunes)
and right click on i-tunes.exe and go to the compatibility tab.
Just choose the Disable Desktop composition, and disable visual themes
click apply and ok.
THe next time you start up I-tunes you'll get a warning about this version being used with out-dated compatibility (the warning is from i-tunes not Vista). just hit ok and i-tunes will load normally
Here's the trick
go back to i tunes.exe and right click and uncheck those two options.
i tunes will now load without the error and look normal.
So far - the black has not returned.
so I'll give myself some points here... I haven't seen this solution anywhere.