I have a general question to ask.
If I have iTunes running on my Windows PC, and something was wrong, could I bring it into the Apple Store's Genius bar for them to service it?
Do they service Apple software outside of Apple hardware?
I went to the Apple store and asked my questions.
They do offer some service for iTunes on a PC. They just won't go beyond anything iTunes-- example the registry or other driver issues. So if it's very much a PC issue, they don't address those. I would think it would be similar to their web browser Safari.
As for service for Apple software on non-Apple hardware, say Mac OS X on an hackintosh, they will not service.