Q: I tunes running slow and intermittent on windows vista

Hi there mouton73!

I have a couple of articles that can address your questions and help resolve any issues you may be seeing. First, I would recommend reinstalling iTunes on your PC:

Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7

http://support.apple.com/kb/HT1923

That article can help walk you through the reinstallation step-by-step. If you are still experiencing issues after following the steps to reinstall your operating system, then you may need to re-create your iTunes library by following these steps:

iTunes: How to re-create your iTunes library and playlists

http://support.apple.com/kb/HT1451

As for the download times, we also have an article that addresses that concern:

iTunes Store: Download times will vary

http://support.apple.com/kb/HT1577

Thanks for using the Apple Support Communities!

Cheers,

Braden