I'm starting to get pissed off at the combination of iTunes, HP, Microsoft and nVidia. I'll mention them all because I don't know where to place the blame for an apparently intractable issue involving what seems to be all of them.
To make a long story shorter, among all the compatibility issues involving iTunes and Vista, none has affected me, and the one that does affect me (and others) is never mentioned except among posters in Apple's support forum.
It seems that any iTunes video stored on an SATA hard drive is unplayable on a Vista machine. You can take the same video and put it on a thumb drive and it will play perfectly.
I just wish that Apple would say something about this issue. iTunes users have been posting about it on Apple's forum for some time, with at least one poster claiming that Apple is aware of the problem. It's been a long time, though, and it's annoying that Apple isn't saying anything.
If this problem isn't fixed, I will probably return my laptop before the six month return policy expires. Trouble is, by then I'd be so pissed off at Apple that I wouldn't get a Mac to replace it.
Come on Apple. Say something!!! Keep your customers informed. I can accept that sometimes there are challenging technical issues, but I don't see any justification for the silence.