MacBook Core Duo (mid '06) 2gz 2GB ram OS 10.4.11 I have been using Windows XP Pro (OEM) for 2 years with Parallels 3. I just updated to Parallels 4 and when I converted my VM, it hung about half way through. I stopped the VM and restarted and the conversion process continued from where it had stopped. It hung again about 3/4 through so I stopped my VM again and when I restarted it continued again from where it stopped and finally completed. I got a message to Validate Windows again so I did and now everything seems fine. I called the same reseller to buy another XP OEM for my new MBP and he told me that it will not work with Parallels!? Does anybody have a definitive answer? Thanks, Wayne.