Windows XP - no problems with 7.5 here except when I plugged in my son's new ipod - the registration page would not go away even though I registered him. I assumed it's because I haven't applied for an iTunes account for him (not a chance). I just told it I'd register later and it popped up a few times after that then stopped - I didn't do anything in particular to stop it either.
I have just upgraded from XP to Vista, and downloaded the latest iTunes, v7.5 and I cant get it to see the device, see link. I thought it was an issue with Vista, but now maybe iTunes itself. Need to find a version 7.4.
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http://www.digitalspy.co.uk/forums/showthread.php?t=696894