Sir or Madam: This is my best recollection: I mistakenly upgraded my version 3 with the latest beta version of four. I decided to go ahead and purchase the new key. I purchased the key, I downloaded the software, I started the process of upgrade and it said that my version of Windows XP needed to be activated. I activated my Windows XP. It then started the process of upgrading. This page was present: http://forum.parallels.com/attachment.php?attachmentid=2316&stc=1&d=1231549632 It said please wait while the virtual machine is being upgraded... preparing to upgrade your virtual machine step one of four. At that point (during step one) it gave me this page which flashed and reverted to the previous screen as noted above: http://forum.parallels.com/attachment.php?attachmentid=2317&stc=1&d=1231549632. Any help would be appreciated. Thank you. Sincerely, Dr. H.