Latest version of iTunes for Windows XP hangs accessing iTunes Store

Any ideas as to why iTunes for Windows XP Pro is now hanging? It didn't seem to have this problem when I only had the iPod Touch, but now I have the new iPhone 3GS and it seems to hang almost every time I start it now. I have the latest updates on iTunes. Hangs whether I start iTunes by windows start or if it start as a result of my plugging in my iPhone.