Be careful and reconsider upgrading. I started out with Parallels 3 with Windows XP on my MacBook Pro (back in 2008), worked perfectly. Upgraded to Version 4 and then to Version 5. Never had an issue upgrading until now. I only use one application in the Windows XP environment and nothing else. I upgraded to Version 6 and it will not work, can not access Hard Disk, program will not load my window application. Just reconsider, because the support is extremely limited, you are left on your own to solve the problem. Might just want to continue using Version 5.